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National Assessment Database

Assessment Data for
Connecticut, Quinnipiac Watershed (8 Digit USGS Cataloging Unit), Year 2006

Description of this table
For a report glossary please click here.

Click on the Water Name link to get 305(b) Lists/Assessment Unit Information Report

Table Legend: Water Status is GoodWater Status is Threatened Water Status is ImpairedWater Status has not been Assessed

Water Name Assessment Unit ID Location Map State Water Type Water Size Unit Water Status
Allen Brook Pond (North Haven/Wallingford) CT5207-02-1-L1_01 Wharton Brook State Park. Impoundment off Allen Brook, near mouth and confluence with Wharton Brook; Wallingford/North Haven boundary. Map Assessed Water CT FRESHWATER LAKE 4.79 ACRES IMPAIRED
Allen Brook-01 CT5207-02_01 From mouth at confluence with Wharton Brook (east of Route 5, south of exit 13 on/off ramp, I91), US to Allen Brook Pond outlet dam, Wallingford. Map Assessed Water CT RIVER .05 MILES IMPAIRED
Allen Brook-02 CT5207-02_02 From inlet to Allen Brook Pond (south of exit 13 on/off ramp, I91), Wallingford/North Haven town borders, US to headwaters (under I91, and then parallel along east side, stays to west side of RailRoad track), Wallingford. Map Assessed Water CT RIVER 1.8 MILES IMPAIRED
Black Pond (Meriden/Middlefield) CT5206-01-1-L2_01 On Meriden/Middlefield town border, south side of Meriden Doad (Route 66). Map Assessed Water CT FRESHWATER LAKE 69.89 ACRES GOOD
Branford Harbor-01 CT5111-E_01 Inner Branford Harbor, from Branford Point US into lower tidal portion of Branford River (upto railroad crossing), including Indian Neck area. Map Assessed Water CT ESTUARY .31 SQUARE MILES IMPAIRED
Branford Harbor-02 CT5111-E_02 From west at Mansfield Point, East Haven, east along shore to Linden Point and Clam Island in Indian Neck area, and offshore SB waters. Map Assessed Water CT ESTUARY 4.52 SQUARE MILES GOOD
Branford River-01 CT5111-00_01 From Route 1 crossing (just DS of I95 crossing), US to confluence with Notch Hill Brook (US of School Ground Road crossing). Map Assessed Water CT RIVER 2.91 MILES GOOD
Branford River-02 CT5111-00_02 From confluence with Notch Hill Brook (US of School Ground Road crossing), Branford, US to Lake Gaillard outlet dam (southeast portion of lake), North Branford. Map Assessed Water CT RIVER 3.07 MILES GOOD
Branford Supply Pond, Northwest (Branford) CT5111-09-2-L3_01 Northwest Branford Supply Pond receives water from Pisgah Brook and Pine Gutter Brook (Int trib to Pisgah Brook). Discharges to Southeast Branford Supply Pond. Ponds located on north side of I95 (east of Lake Saltonstall area). Map Assessed Water CT FRESHWATER LAKE 9.39 ACRES IMPAIRED
Branford Supply Pond, Southeast (Branford) CT5111-09-2-L3_02 Southeast Branford Supply Pond located on north side of I95, receives water from northwest Branford Supply Pond, and discharges to Pisgah Brook below ponds (continues into Branford River below Route 1 crossing). Map Assessed Water CT FRESHWATER LAKE 17.05 ACRES GOOD
Burrs Brook-01 CT5112-10_01 From mouth at confluence with Farm River (just DS of Totoket Road crossing), US to discharge stream from Vic's Pond (on Tomasso property). Brook contributes to drinking water supply, Lake Saltonstall. Map Assessed Water CT RIVER 1.35 MILES IMPAIRED
Cedar Pond (North Branford) CT5111-09-1-L1_01 South of Lake Gaillard, North Branford, just upstream of Linsley Pond along Pisgah Brook (trib to Branford River). Map Assessed Water CT FRESHWATER LAKE 21.58 ACRES IMPAIRED
Clinton Harbor (Offshore)-04 CT5106-E_04 All SA water of outer Clinton Harbor from New Haven County line on west, east accross Cedar Island and continuing along coast to Kelsey Point, and offshore past Stone Isaland area (includes Town Beach). Map Assessed Water CT ESTUARY 1.43 SQUARE MILES IMPAIRED
Dayton Brook-01 CT5201-04_01 From mouth at confluence with Eightmile River (west side of I84, south of Jude Lane), US to headwaters (just US of Sandra Lane crossing), Southington. Map Assessed Water CT RIVER 2.03 MILES GOOD
Edgewood Park Pond (New Haven) CT5305-00-3-L1_01 Along eastern bank of West River, just US of Chapel St, New Haven. Map Assessed Water CT FRESHWATER LAKE 2.72 ACRES IMPAIRED
Eightmile River (Southington)-01 CT5201-00_01 From mouth at confluence with Quinnipiac River (DS of West Main Street crossing and just DS of RailRoad crossing), US to Grannis Pond outlet dam (just US of Churchhill Street crossing), Southington. Map Assessed Water CT RIVER 3.39 MILES IMPAIRED
Eightmile River (Southington)-02 CT5201-00_02 From Grannis Pond inlet (just DS of Welch Road crossing), Southington, US to headwaters at Bristol Fish & Game Club Pond outlet dam, Wolcott. Map Assessed Water CT RIVER 2.37 MILES GOOD
Farm River (East Haven)-01 CT5112-00_01 From saltwater limit at marsh (just DS of MAin Street Anx. crossing, southwest of Lake Saltonstall outflow), East Haven, US (parallel to lake, around west side) to confluence with Burrs Brook (DS of Route 80 crossing), North Branford. Map Assessed Water CT RIVER 6.14 MILES GOOD
Farm River (East Haven)-02 CT5112-00_02 From confluence with Burrs Brook (DS of Route 80 crossing), US to Pages Mill Pond outlet dam, US side of Mill Road crossing, North Branford. Map Assessed Water CT RIVER 1.24 MILES IMPAIRED
Farm River (East Haven)-03 CT5112-00_03 From Pages Mill Pond inlet, US to headwaters (just US of Hyla Lane crossing, near Middletown Avenue (Route 17) are), North Branford. Map Assessed Water CT RIVER 8.87 MILES GOOD
Guilford Harbor-01 CT5110-E_01 Inner Sachem Head Harbor in west, inner Indan Cove, shore area north of Mulberry Point out to small island, and all of Guilford Harbor, including tidal tributaries east to Grass Island area, Guilford. Map Assessed Water CT ESTUARY .64 SQUARE MILES IMPAIRED
Guilford Harbor-02 CT5110-E_02 From Sachem Head area in west, east along shore to just west of Circle Beach area, Guilford and out to extent of conditionally approved area (just beyond Outer White Top); Excluding restricted and prohibited areas included in CT5110-E_01. Map Assessed Water CT ESTUARY 2.23 SQUARE MILES IMPAIRED
Hammonasset River-01 CT5106-00_01 From saltwater limit at DS most portion of I95 crossing, Madison/Clinton town border, US to Hammonassett Reservoir outlet dam (just US of Route 80 crossing), Killingworth/Madison town border. Map Assessed Water CT RIVER 8.07 MILES GOOD
Hammonasset River-02 CT5106-00_02 From Hammonassett Reservoir inlet (at northeastern most corner, just DS of Bunnell Bridge Road crossing), US to County Road crossing (just US of confluence with Bunker Hill Brook), Killingworth/Madison town border. Map Assessed Water CT RIVER 2.62 MILES GOOD
Hammonasset River-03 CT5106-00_03 From County Road crossing (just US of confluence with Bunker Hill Brook), Killingworth/Madison town border, US to Madison Road (Route 79) crossing at Madison/Durham border. Map Assessed Water CT RIVER 3.43 MILES GOOD
Hanover Pond (Meriden) CT5200-00-4-L2_01 Southwest corner of Meriden, impoundment along Quinnipiac River below Gorge. Map Assessed Water CT FRESHWATER LAKE 70.53 ACRES IMPAIRED
Harbor Brook (Meriden)-01 CT5206-00_01 From mouth at confluence with Quinnipiac River (flows into north side of Hanover Pond portion of river, DS of Bradley Avenue crossing), US to exit of box culvert (just DS of RailRoad and Main Street (Route 71) crossings), Meriden. Map Assessed Water CT RIVER 2.02 MILES IMPAIRED
Harbor Brook (Meriden)-02 CT5206-00_02 From exit of box culvert (just DS of RailRoad and Main Street (Route 71) crossings), US to culvert entrance (just US of Fire Station, and US of Mill Street crossing), Meriden. Map Assessed Water CT RIVER .4 MILES IMPAIRED
Harbor Brook (Meriden)-03 CT5206-00_03 From culvert entrance (just US of Fire Station, and US of Mill Street crossing), US to Baldwins Pond outlet dam (just US of Westfield Road crossing), Meriden. Map Assessed Water CT RIVER 1.48 MILES IMPAIRED
Hayden Creek-02 CT5106-E_02 Hayden Creek, tributary to Hammonassett River on east side approximatly 1/2 mile south of Route 1 crossing, runs parallel to Pratt Avenue US to Maple Avenue, area southwest of Route 1 and Grove Street, Clinton. Map Assessed Water CT ESTUARY .01 SQUARE MILES IMPAIRED
Honeypot Brook-01 CT5200-07_01 Mouth at confluence with Quinnipiac River, (US of Blacks Road crossing), US to headwaters, US of Wiese Road crossing (near Route 70), Cheshire. Map Assessed Water CT RIVER 4.95 MILES GOOD
Indian River (Clinton)-01 CT5104-00_01 Head of tide at Indian Lake dam outlet, (DS end of Indian Lake, south side of I95), Clinton, US to headwaters (at wetland, just US of Hemlock Drive crossing, parallel to Route 81), Killingworth. Map Assessed Water CT RIVER 7.93 MILES GOOD
Island Bay And Joshua Cove (Offshore)-02 CT5002-E_02 Offshore from west at Outer Island, northeast to Narrows Island, through Clark Point area on Leetes Island, Branford, southwest to Sachem Head area, Guilford. (all SA, shellfish approved area). Map Assessed Water CT ESTUARY 2.15 SQUARE MILES GOOD
Island bay And Joshua Cove (Nearshore)-01 CT5002-E_01 Conditionally approved areas of Little Harbor north of line between Harrison Point and Clark Point, Island Bay, and Joshua Bay, Guilford. Also prohibited area in Island Creek, north of Route 146 and railroad crossing. Map Assessed Water CT ESTUARY .54 SQUARE MILES IMPAIRED
Linsley Pond (Branford/North Branford) CT5111-09-1-L2_01 South of Lake Gaillard, North Branford, just downstream of Cedar Pond along Pisgah Brook (trib to Branford River). Linsley Pond straddles Branford-North Branford town line. Map Assessed Water CT FRESHWATER LAKE 22.92 ACRES IMPAIRED
Long Island Sound Central (Offshore)-03 CT5004-E_03 All SA, shellfish approved areas: offshore from Branford, Guilford, and Madison out to 50 ft contour. Map Assessed Water CT ESTUARY 36.97 SQUARE MILES GOOD
Lower Hammonassett River And InnerClinton Harbor-03 CT5106-E_03 All SB, restricted relay waters in Inner Clinton Harbor from mouths of the Hammock and Indian Rivers US into Hammonasset River, up to Rte 1 crossing, Clinton. Excludes Cedar Island Marina area (segment-05). Map Assessed Water CT ESTUARY .41 SQUARE MILES IMPAIRED
Madison Beaches-01 CT5001-E_01 Nearshore & offshore from Circle Beach and Hogs Head Pt, near Guilford, east to Tuxis Island & Gull Rock, Madison (excluding restricted relay and conditonal shellfish areas adjacent to shore-segment 02 & 03). Map Assessed Water CT ESTUARY 3.28 SQUARE MILES GOOD
Madison Beaches-02 CT5001-E_02 Conditionally approved waters nearshore from Chipman Point, east to Madison Surf Club; east from West Warf area, past Gull Rock/Tuxis Island, to Webster Point, (excluding all approved or restricted relay waters of segment1&2). Map Assessed Water CT ESTUARY 3.29 SQUARE MILES IMPAIRED
Madison Beaches-03 CT5001-E_03 Restricted relay waters near shore at Circle Beach, Chipman Point, Madison Surf Club area east to West Warf area, mouth of Fence Crk, and from Webster Point east to West Rock at Madison/Clinton town line, out to 50 ft contour (includes Hammonasset Beach). Map Assessed Water CT ESTUARY 3.97 SQUARE MILES IMPAIRED
Menunketesuck River-01 CT5103-00_01 From inlet to Chapman Pond (just DS of Pleasant Valley Road crossing), Westbrook, US to Lockwood Lake outlet dam on Bushy Pond (just US of Woods Lane crossing), Clinton. Map Assessed Water CT RIVER 2.03 MILES GOOD
Menunketesuck River-02 CT5103-00_02 From Bushy Pond inlet (just DS of Kelseytown Road crossing), Clinton, US to Kelseytown Reservoir outlet dam (just US of Kelseytown Brodge Road crossing), Clinton-Killingworth border. Map Assessed Water CT RIVER 1.78 MILES IMPAIRED
Menunketesuck River-03 CT5103-00_03 From Kelseytown Reservoir inlet (northeast corner), Clinton-Killingworth border, US to North Roast Meat Hill Road crossing (just US of Route 148 crossing), Killingworth. Map Assessed Water CT RIVER 5.17 MILES GOOD
Milford Harbor And Gulf Pond-01 CT5306-E_01 Milford Harbor from mouth upto saltwater limit at Route 162, and Gulf Pond US including tidal portions of the Wepawaug and Indian Rivers. Map Assessed Water CT ESTUARY .27 SQUARE MILES IMPAIRED
Milford Harbor And Gulf Pond-02 CT5306-E_02 SB waters of The Gulf, Milford from Charles Island on the west, into and along shoreline to east at Wlches Point, Milford (excludes central area of The Gulf, which is SB/SA water-segment CT5306-E_03). Map Assessed Water CT ESTUARY .59 SQUARE MILES GOOD
Mill River (Cheshire)-03 CT5302-00_03 From Cook Hill Road crossing, Cheshire, US to headwaters (US of Williamsburg Drive crossing). Map Assessed Water CT RIVER 3.09 MILES GOOD
Mill River (Hamden/Cheshire)-02 CT5302-00_02 From inlet to Lake Whitney (east side of Route 15, just DS of Connolly Parkway crossing), Hamden, US to Cook Hill Road crossing, Cheshire. Map Assessed Water CT RIVER 9.06 MILES GOOD
Mill River (New Haven-Hamden)-01 CT5302-00_01 From south bound I91 crossing (at exit 6 offramp), New Haven, US to Lake Whitney outlet dam, Hamden. Segment is tidal, but not saltwater. Map Assessed Water CT RIVER 1.71 MILES IMPAIRED
Misery Brook-01 CT5203-00_01 From mouth at Quinnipiac River (just DS of Meriden Waterbury Turnpike (Route 322) crossing), Cheshire/Southington border, US to Slopers Pond outlet dam( just US of East Street crossing), Southington. Map Assessed Water CT RIVER 4.23 MILES IMPAIRED
Muddy Brook (Wallingford)-04 CT5208-00_04 From Spring Lake outlet dam (US of Durham Road crossing, east of I91), US to Church Street (Route 68) crossing (just US of Killam Pond, and east of exit 15, I91), Wallingford. Segment includes Spring Lake. Map Assessed Water CT RIVER .86 MILES GOOD
Muddy River (North Haven)-01 CT5208-00_01 From mouth at confluence with Quinnipiac River (saltwater limit, just DS of RailRoad crossing on west side of I91, south of Sackett Point Road), US to Muddy River Pond outlet dam, North Haven. Map Assessed Water CT RIVER .68 MILES GOOD
Muddy River (North Haven)-02a CT5208-00_02A From Muddy River Pond inlet (east side of I91), North Haven, US to confluence with unnnamed tributary (outlet for Tamarac Swamp), just DS of Tyler Mill Road crossing, Wallingford. Map Assessed Water CT RIVER 8.1 MILES GOOD
Muddy River (Wallingford)-02b CT5208-00_02B From confluence with unnnamed tributary (outlet for Tamarac Swamp), just DS of Tyler Mill Road crossing, Wallingford, US to MacKenzie Reservoir outlet dam (US of Northford Road crossing), Wallingford. Map Assessed Water CT RIVER 1.81 MILES IMPAIRED
Muddy River (Wallingford)-03 CT5208-00_03 From MacKenzie Reservoir inlet (northeastern portion, just DS of Scard Road crossing), US to Spring Lake outlet dam (US of Durham Road crossing, east of I91), Wallingford. Map Assessed Water CT RIVER 1.98 MILES GOOD
Neck River-01 CT5107-00_01 From head of tide (marsh exit, parallel to Neck Road, DS of Route 1 crossing), US to headwaters (just northeast of Roure 80 and Route 79 rotary intersection, and south of aqueduct), Madison. Map Assessed Water CT RIVER 9.49 MILES GOOD
New Haven Harbor (Inner Harbor, Mill, Q, West Rivers)-01 CT5200-E_01 From mouth of inner New Haven Harbor (bounded by Sandy Point/Morse Park nearshore area, West Haven, and Black Rock, East Haven), US and including tidal portions of the Quinnipiac, Mill, and West Rivers. Map Assessed Water CT ESTUARY 3.64 SQUARE MILES IMPAIRED
New Haven Harbor (Outer Harbor and Morris Cove)-03 CT5200-E_03 From west in Oyster River Point area, W. Haven, northeast near coast, across harbor to Black Rock area, E. Haven, south out to Morgan Pt and outer NH breakwater (includes Morris Cove). Map Assessed Water CT ESTUARY 5.03 SQUARE MILES IMPAIRED
New Haven Harbor (West Haven Shore, Cove, Oyster River)-02 CT5200-E_02 From Oyster Point, West Haven, west along shore to mouth of Oyster River, US to saltwater limit; and north along West Haven shore from Rock Beach to Sandy Point, including tidal portion of Cove River. 2 beaches in segment. Map Assessed Water CT ESTUARY .56 SQUARE MILES IMPAIRED
New Haven Harbor Offshore-04 CT5200-E_04 From west at Pond Point northeast along shore to Oyster River Point, east approximatley 1.6 miles offshore, and south to SB SA water quality transition (outer NH Harbor breakwater). Map Assessed Water CT ESTUARY 5.99 SQUARE MILES IMPAIRED
New Haven Harbor Offshore-05 CT5200-E_05 SB water from west at end of segment_04, approximatly 1.6 miles east of Oyster River Point, east to Morgan Point, East Haven, and south to SA and SB water transition. Map Assessed Water CT ESTUARY 5.76 SQUARE MILES IMPAIRED
North Farms Reservoir (Wallingford) CT5207-00-1-L1_01 0.5 miles west of Rt. 91, north side of Rt. 68, Wallingford. Headwaters of Wharton Brook. Map Assessed Water CT FRESHWATER LAKE 66.07 ACRES GOOD
Patchogue And Menunketesuck Rivers-01 CT5102-E_01 Nearshore from west at Kelsey Point, east past Duck Island, continuing northeast to shore near Long Rock, westbrook, and tidal portions of Patchogue & Menunketesuck Rivers (includes West and Middle Beaches). Map Assessed Water CT ESTUARY 3.52 SQUARE MILES IMPAIRED
Patton Brook-01 CT5200-02_01 From mouth at confluence with Quinnipiac River (just DS of River Road crossing), US to headwaters at unnamed pond (US of confluence with Mill Pond tributary, just US of Malcein Drive crossing), Southington. Map Assessed Water CT RIVER 2.84 MILES GOOD
Plum Bank And Indian Harbor-01 CT5101-E_01 SB/SA waters from west at Old Kelsey Point, Westbrook, east to Cornfield Point, Old Saybrook (includes Indiantown Harbor & Plum Bank Beach) Map Assessed Water CT ESTUARY 1 SQUARE MILES IMPAIRED
Pond Meadow Brook-01 CT5105-01_01 From mouth at confluence with Chatfield Hollow Brook (just DS of Old Mill Pond outlet dam on Chatfield Hollow Brook, in Chatfield Hollow State Park), US to Kroupa Pond outlet dam (just US of Route 148 crossing), Killingworth. Map Assessed Water CT RIVER .7 MILES GOOD
Quinnipiac River-01 CT5200-00_01 From Clintonville Road crossing (Route 5 and 22, section of road west of I91, and east of Route 15), North Haven, US to Toelles Road crossing (head of tide), Wallingford/North Haven town border. Map Assessed Water CT RIVER 5.05 MILES IMPAIRED
Quinnipiac River-02 CT5200-00_02 From Toelles Road crossing (head of tide, just east of Route 15), Wallingford/North Haven town border, US to Hanover Pond outlet dam, Meriden. (Segment includes Community Lake portion) Map Assessed Water CT RIVER 8.5 MILES IMPAIRED
Quinnipiac River-03 CT5200-00_03 From Hanover Pond inlet (at Oregon Road crossing, DS enr of Quinnipiac Gorge), Meriden, US (through Gorge) to Waterworks (breached dam), just DS of Cheshire/Meriden town border (parallel to River Road (Route 70)). Map Assessed Water CT RIVER 1.29 MILES IMPAIRED
Quinnipiac River-04 CT5200-00_04 From Waterworks (breached dam), just DS of Cheshire/Meriden town border (parallel to River Road (Route 70)), US to confluence with Tenmile River (US of Route 322 crossing, and US of Southington WPCF). Map Assessed Water CT RIVER 4.78 MILES IMPAIRED
Quinnipiac River-05 CT5200-00_05 From confluence with Tenmile River (US of Route 322 crossing, and US of Southington WPCF), US to Queen Street (Route 10) crossing (US of RailRoad crossing, North of I-84 crossing), Southington. Map Assessed Water CT RIVER 8.32 MILES IMPAIRED
Quinnipiac River-06 CT5200-00_06 From Queen Street (Route 10) crossing (US of RailRoad crossing, North of I-84 crossing), Southington, US to Hamlin Pond outlet dam (US of Pine Street crossing), Plainville. Map Assessed Water CT RIVER 3 MILES IMPAIRED
Quinnipiac River-07 CT5200-00_07 From Hamlin Pond inlet (northeast corner, just south of Route 72 and I84 connection and RailRoad), Plainville, US to headwaters at Dead Wood Swamp (west side of I84, near exit 37, just south of Route 6), Farmington. Map Assessed Water CT RIVER 3.5 MILES IMPAIRED
Quonnipaug Lake (Guilford) CT5110-04-1-L1_01 Guilford just east of Rt 77, 2 miles north of Rt 80. Map Assessed Water CT FRESHWATER LAKE 96.1 ACRES GOOD
Roaring Brook (Southington)-01 CT5201-08_01 From mouth at confluence with Dayton Brook (west side of I84), Southington, US to New Britian Reservoir outlet dam at south end of Wolcott Reservoir, Wolcott. Map Assessed Water CT RIVER 2.25 MILES GOOD
Sargent River-01 CT5303-00_01 From mouth at confluence with West River (DS of Route 69 crossing) at inlet to Lake Dawson, Woodbridge, US to headwaters at Munson Road Pond outlet dam, Bethany (EXCLUDING Lake Glen and Lake Chamberlain). Map Assessed Water CT RIVER 3.96 MILES GOOD
Schreeder Pond (Killingworth) CT5105-00-2-L1_01 Chatfield Hollow State Park. Impoundment of Chatfield Hollow Brook, US of Rte 80 crossing, Killingworth. Map Assessed Water CT FRESHWATER LAKE 3.94 ACRES GOOD
Sodom Brook-01 CT5205-00_01 From mouth at confluence with Quinnipiac River (flows into north side of Hanover Pond portion of river), US to headwaters (just US of second Hicks Avenue crossing, due to river changing direction), Meriden. Map Assessed Water CT RIVER 4.16 MILES IMPAIRED
Tenmile River (Cheshire)-02 CT5202-00_02 From inlet to Moss Farms Pond (on southwest end), US to headwaters at Mixville Pond outlet dam (just US of Notch Road crossing), Cheshire. Map Assessed Water CT RIVER 1.42 MILES GOOD
Tenmile River (Southington/Cheshire)-01 CT5202-00_01 From mouth at confluence with Quinnipiac River (DS of Old Turnpike Road crossing), Southington, US to Lake Percivel outlet dam on Moss Farms Pond (just US of Jarvis Street crossing), Cheshire. Map Assessed Water CT RIVER 4.1 MILES IMPAIRED
Thimble Islands Offshore-03 CT5003-E_03 Shellfish approved SA water from Spectacle Island east to Middle rock, north to and along shorline from Hotchkiss Grove Beach to Brown Point (Branford), continuing east nearshore to Hoadley Point; then offshore southwest to Outer Island. Map Assessed Water CT ESTUARY 2.93 SQUARE MILES GOOD
Thimble Islands-01 CT5003-E_01 Nearshore from west at Brown Point, east through Jupiter Point, Pleasant Point, to Flying Point, and all tidal creeks/rivers leading to area of upper Stony Creek and Hadley Neck. Map Assessed Water CT ESTUARY .46 SQUARE MILES IMPAIRED
Thimble Islands-02 CT5003-E_02 Nearshore from west at Clam Island, east to Haycock Point, and out to Middle Rock; then, nearshore from Rogers Island east to Hoadley Point, and offshore area between Pot Island north to Davis Island. Map Assessed Water CT ESTUARY 1.45 SQUARE MILES IMPAIRED
Unnamed trib to Oyster River (Milford)-01 CT5000-55_01 From Merwin Avenue crossing, US to RailRoad (Amtrak) crossing (just US of Quirkes Pond (included in segment)), Milford. Map Assessed Water CT RIVER 1.47 MILES IMPAIRED
Upper Hammonassett River, Indian, Hammock Rivers-01 CT5106-E_01 All SA and SB/SA water, not supporting shellfishing, including upper tidal portion of Hammonassett River and small tributaries around inner Clinton Harbor; also, all tidal portions of both Indian and Hammock Rivers. Map Assessed Water CT ESTUARY .14 SQUARE MILES IMPAIRED
Wepawaug River-01 CT5307-00_01 From wepawaug Pond outlet dam (head of tide) at New Haven Avenue (Route 162) crossing, US to Route 1 crossing, Milford. Segment includes Wepawaug Pond and City Pond portions on river. Map Assessed Water CT RIVER .77 MILES IMPAIRED
Wepawaug River-02 CT5307-00_02 From Route 1 crossing, Milford, US to Lake Wepawaug inlet, Orange. Segment includes Lake Wepawaug portion on river. Map Assessed Water CT RIVER 4.2 MILES IMPAIRED
Wepawaug River-03 CT5307-00_03 From inlet to Lake Wepawaug, US to inlet to Wepawaug Reservoir (US of Route 34 crossing), Orange. Segment includes Wepawaug Reservoir portion of river. Map Assessed Water CT RIVER 2.33 MILES GOOD
Wepawaug River-04 CT5307-00_04 From inlet to Wepawaug Reservoir, Orange, US to area east of Racebrook Road (Route 114), perpendicular to Milan Road, Woodbridge. Map Assessed Water CT RIVER 3.05 MILES GOOD
Wepawaug River-05 CT5307-00_05 From area east of Racebrook Road (Route 114), perpendicular to Milan Road, US to headwaters at Center Street Pond outlet dam (on Keenes Ice Pond), just US of Center Road (Route 14) crossing, Woodbridge, Map Assessed Water CT RIVER .99 MILES GOOD
West River (Guilford)-01 CT5110-00_01 From Route 1 crossing (just DS of confluence with Spinning Mill Brook), US to confluence with unnamed tributary from Thirsty Lake outlet (just DS of Flat Meadow Road crossing), Guilford. Map Assessed Water CT RIVER 2.22 MILES GOOD
West River (Guilford)-02 CT5110-00_02 From confluence with unnamed tributary from Thirsty Lake outlet (just DS of Flat Meadow Road crossing), US to confuence with Branch Brook (just US of Race Hill Road crossing, parallel with Route 77), DS of lake Quonnipaug outlet dam, Guilford. Map Assessed Water CT RIVER 5.41 MILES GOOD
West River (New Haven/Woodbridge)-01 CT5305-00_01 From head of tide (tide gates) at Chapel Street crossing (just DS of Edgewood Park Pond), New Haven, US to Konolds Pond outlet dam (just US of Bradley Road crossing), Woodbridge. Map Assessed Water CT RIVER 3.23 MILES IMPAIRED
West River (Woodbridge/Bethany)-02 CT5305-00_02 From inlet to Konolds Pond (northern portion of lake, east side of Route 69), Woodbridge, US to Lake Bethany outlet dam, Bethany. Segment includes Lake Dawson and Lake Watrous. Map Assessed Water CT RIVER 4.9 MILES GOOD
Wharton Brook-01 CT5207-00_01 From mouth at confluence with Quinnipiac River (DS of Route 5 and RailRoad crossing), Wallingford/North Haven town borders, US to Simpson Pond outlet dam (US of Center Street (Route 150) crossing), Wallingford. Map Assessed Water CT RIVER 3.97 MILES IMPAIRED
Wharton Brook-02 CT5207-00_02 From inlet to Simpson Pond, US to North Farms Reservoir outlet dam (just US of Church Street (Route 68) crossing), Wallingford. Map Assessed Water CT RIVER 2.94 MILES GOOD
Whitney, Lake (Hamden) CT5302-00-4-L3_01 Impoundment of Mill River, Hamden. Northern most portion near south side of Route 15, exit 60 (intersection with Route 10). Map Assessed Water CT FRESHWATER LAKE 140.42 ACRES GOOD

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State Causes of Impairment

Connecticut, Quinnipiac Watershed

Description of this table
State Cause Name Size of Assessed Waters with Listed Causes of Impairment
Rivers, Streams, Creeks (Miles) Lakes, Ponds, Reservoir (Acres) Bays, Estuaries (Square Miles) Coastal Shorelines (Miles) Oceans, Near Coastal Waters (Square Miles) Wetlands (Acres) Great Lakes Shoreline (Miles) Great Lakes Open Waters (Square Miles) Inland Lake Shoreline (Miles) Great Lakes Connecting Channel (Miles)
TOTAL SUSPENDED SOLIDS (TSS) .00 28.17 .00 .00 .00 .00 .00 .00 .00 .00
EXCESS ALGAL GROWTH .00 133.50 .00 .00 .00 .00 .00 .00 .00 .00
ZINC .00 .00 .03 .00 .00 .00 .00 .00 .00 .00
CAUSE UNKNOWN 124.10 .00 .00 .00 .00 .00 .00 .00 .00 .00
NITROGEN (TOTAL) .00 .00 23.50 .00 .00 .00 .00 .00 .00 .00
NUTRIENT/EUTROPHICATION BIOLOGICAL INDICATORS .00 345.09 64.17 .00 .00 .00 .00 .00 .00 .00
SODIUM 2.70 .00 .00 .00 .00 .00 .00 .00 .00 .00
LEAD .00 .00 .03 .00 .00 .00 .00 .00 .00 .00
TEMPERATURE, WATER 3.62 .00 .00 .00 .00 .00 .00 .00 .00 .00
POLYCHLORINATED BIPHENYLS 41.56 141.06 18.46 .00 .00 .00 .00 .00 .00 .00
PHYSICAL SUBSTRATE HABITAT ALTERATIONS 7.80 .00 .00 .00 .00 .00 .00 .00 .00 .00
ENTEROCOCCUS 9.56 141.06 7.28 .00 .00 .00 .00 .00 .00 .00
OIL AND GREASE .00 .00 17.34 .00 .00 .00 .00 .00 .00 .00
OTHER FLOW REGIME ALTERATIONS 15.64 .00 .00 .00 .00 .00 .00 .00 .00 .00
ESCHERICHIA COLI 99.86 15.02 .00 .00 .00 .00 .00 .00 .00 .00
CHLOROPHYLL-A .00 133.50 .00 .00 .00 .00 .00 .00 .00 .00
SEDIMENTATION/SILTATION .00 159.84 .00 .00 .00 .00 .00 .00 .00 .00
FECAL COLIFORM .00 .00 58.44 .00 .00 .00 .00 .00 .00 .00
DISSOLVED OXYGEN SATURATION .00 89.00 42.78 .00 .00 .00 .00 .00 .00 .00
OXYGEN, DISSOLVED .00 .00 42.78 .00 .00 .00 .00 .00 .00 .00
TURBIDITY 4.05 161.67 .00 .00 .00 .00 .00 .00 .00 .00
COPPER .00 .00 .03 .00 .00 .00 .00 .00 .00 .00

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Probable Sources Contributing to Impairment

Connecticut, Quinnipiac Watershed

 Description of this table
State Source Name Size of Assessed Waters with Probable Sources of Impairment
Rivers, Streams, Creeks (Miles) Lakes, Ponds, Reservoir (Acres) Bays, Estuaries (Square Miles) Coastal Shorelines (Miles) Oceans, Near Coastal Waters (Square Miles) Wetlands (Acres) Great Lakes Shoreline (Miles) Great Lakes Open Waters (Square Miles) Inland Lake Shoreline (Miles) Great Lakes Connecting Channel (Miles)
ON-SITE TREATMENT SYSTEMS (SEPTIC SYSTEMS AND SIMILAR DECENCENTRALIZED SYSTEMS) .00 .00 19.08 .00 .00 .00 .00 .00 .00 .00
CONTAMINATED SEDIMENTS 1.47 .00 8.67 .00 .00 .00 .00 .00 .00 .00
WET WEATHER DISCHARGES (POINT SOURCE AND COMBINATION OF STORMWATER, SSO OR CSO) .00 .00 3.64 .00 .00 .00 .00 .00 .00 .00
UPSTREAM IMPOUNDMENTS (E.G., PL-566 NRCS STRUCTURES) 14.48 .00 .00 .00 .00 .00 .00 .00 .00 .00
SITE CLEARANCE (LAND DEVELOPMENT OR REDEVELOPMENT) 34.91 .00 .00 .00 .00 .00 .00 .00 .00 .00
RESIDENTIAL DISTRICTS .00 .00 40.65 .00 .00 .00 .00 .00 .00 .00
NON-POINT SOURCE .00 70.53 40.64 .00 .00 .00 .00 .00 .00 .00
IRRIGATED CROP PRODUCTION 4.23 .00 .00 .00 .00 .00 .00 .00 .00 .00
GOLF COURSES 3.97 .00 .00 .00 .00 .00 .00 .00 .00 .00
IMPACTS FROM HYDROSTRUCTURE FLOW REGULATION/MODIFICATION 28.28 .00 .00 .00 .00 .00 .00 .00 .00 .00
ILLICIT CONNECTIONS/HOOK-UPS TO STORM SEWERS 2.42 .00 .00 .00 .00 .00 .00 .00 .00 .00
BASEFLOW DEPLETION FROM GROUNDWATER WITHDRAWALS 29.28 .00 .00 .00 .00 .00 .00 .00 .00 .00
SURFACE MINING 4.85 44.50 .00 .00 .00 .00 .00 .00 .00 .00
UNSPECIFIED URBAN STORMWATER 42.82 122.54 40.65 .00 .00 .00 .00 .00 .00 .00
STREAMBANK MODIFICATIONS/DESTABLIZATION .00 9.39 .00 .00 .00 .00 .00 .00 .00 .00
ANIMAL FEEDING OPERATIONS (NPS) 1.24 .00 .00 .00 .00 .00 .00 .00 .00 .00
LANDFILLS 35.04 .00 .56 .00 .00 .00 .00 .00 .00 .00
AGRICULTURE 3.05 .00 .00 .00 .00 .00 .00 .00 .00 .00
CHANNELIZATION 3.90 .00 .00 .00 .00 .00 .00 .00 .00 .00
MANAGED PASTURE GRAZING 1.24 .00 .00 .00 .00 .00 .00 .00 .00 .00
FLOW ALTERATIONS FROM WATER DIVERSIONS 7.82 .00 .00 .00 .00 .00 .00 .00 .00 .00
MUNICIPAL POINT SOURCE DISCHARGES 26.16 70.53 20.98 .00 .00 .00 .00 .00 .00 .00
COMBINED SEWER OVERFLOWS 4.94 2.72 9.23 .00 .00 .00 .00 .00 .00 .00
ABOVE GROUND STORAGE TANK LEAKS (TANK FARMS) 20.78 70.53 .00 .00 .00 .00 .00 .00 .00 .00
MARINA/BOATING SANITARY ON-VESSEL DISCHARGES .00 .00 34.24 .00 .00 .00 .00 .00 .00 .00
HIGHWAY/ROAD/BRIDGE RUNOFF (NON-CONSTRUCTION RELATED) 1.47 70.53 .00 .00 .00 .00 .00 .00 .00 .00
POST-DEVELOPMENT EROSION AND SEDIMENTATION 3.97 9.39 .00 .00 .00 .00 .00 .00 .00 .00
WATERFOWL 4.97 2.72 34.25 .00 .00 .00 .00 .00 .00 .00
ATMOSPHERIC DEPOSITION - NITROGEN .00 .00 21.39 .00 .00 .00 .00 .00 .00 .00
SOURCE UNKNOWN 62.86 .00 15.39 .00 .00 .00 .00 .00 .00 .00
INDUSTRIAL POINT SOURCE DISCHARGE 13.55 .00 20.99 .00 .00 .00 .00 .00 .00 .00

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Clicking anywhere on this watershed map will take you to the Enviromapper for Water website, where you can view and map various types of environmental information for the watershed. This information includes Superfund sites, water discharge permits, toxic releases, and more.

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