11162765 SAN FRANCISCO BAY AT SAN MATEO BRIDGE, NEAR FOSTER CITY, CA
LOCATION.-Lat 37°35'04", long 122°14'59", unsurveyed, T.4 S., R.4 W., in San Mateo County, Hydrologic
Unit 18050004, on Pier 20 of the San Mateo Bridge.
PERIOD OF RECORD.-October 1989 to current year.
SPECIFIC CONDUCTANCE: October 1989 to current year.
WATER TEMPERATURE: October 1989 to current year.
PERIOD OF DAILY RECORD.-October 1989 to current year.
SPECIFIC CONDUCTANCE: October 1989 to current year.
WATER TEMPERATURE: October 1989 to current year.
INSTRUMENTATION.-Water-quality monitor since October 1989.
REMARKS.-Interruptions in record were usually due to malfunction of the sensing and (or) recording instruments.
Upper probe is set at 3.5 ft below Mean Lower Low Water (MLLW). Lower probe is set at 38.0 ft below MLLW. Daily
maximums and minimums sometimes differ from tidal-cycle (24.8 hours) maximums and minimums. On Mar. 9, 1999, the
station was temporarily shut down for seismic retrofit of the bridge and data was not collected through Sept. 30,
1999.
EXTREMES FOR PERIOD OF DAILY RECORD.-
SPECIFIC CONDUCTANCE: (Upper probe) Maximum recorded, 50,200 microsiemens, Sept. 5, 1990; minimum recorded,
11,500 microsiemens, Mar. 17, 1996.
(Lower probe) Maximum recorded, 50,300 microsiemens, Oct. 31, Nov. 4, 9, 1990; minimum recorded, 14,900
microsiemens, Mar. 5, 1998.
WATER TEMPERATURE: (Upper probe) Maximum recorded, 23.5C, Aug. 1, 2, 28, 1993, Aug. 8, 1995; minimum recorded,
6.5C, on several days in December 1990 and January 1991.
(Lower probe) Maximum recorded, 23.0C, on several days in August 1990, July 16, 17, 1992, Aug. 2-6, 1993, July
16, 31, and several days in August 1995; minimum recorded, 6.5C, Dec. 30, 1990, to Jan. 2, 1991.
EXTREMES FOR CURRENT YEAR.-
SPECIFIC CONDUCTANCE: (Upper probe) Maximum recorded, 42,000 microsiemens, Nov. 25; minimum recorded, 23,900
microsiemens, Feb. 24.
(Lower probe) Maximum recorded, 42,300 microsiemens, Nov. 7, 8, 23; minimum recorded, 25,100 microsiemens, Mar.
3.
WATER TEMPERATURE: (Upper probe) Maximum recorded, 18.5C, Oct. 1, 2; minimum recorded, 8.5C, several days in
December.
(Lower probe) Maximum recorded, 18.5C, Oct. 1, 2; minimum recorded, 8.5C, several days in December.
SPECIFIC CONDUCTANCE (MICROSIEMENS/CM AT 25 DEG.C), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
(UPPER PROBE)
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH
1 40400 39200 41200 39500 41600 39800 36200 35200 36900 34100 26700 25500
2 40400 39000 41600 39700 41300 39100 36200 34300 36900 34000 26600 25500
3 40300 39200 41800 39200 41100 38900 36300 34000 36600 34100 26300 24600
4 40400 39300 41800 39100 41100 38500 36400 34300 36400 34800 --- ---
5 40400 39000 41900 38600 41100 39700 36600 34800 36500 35100 --- ---
6 --- --- 41700 39800 41100 37600 36500 34900 36300 35300 --- ---
7 40500 38800 41600 40200 41100 37400 36600 35200 35900 34400 --- ---
8 40300 38900 41900 40500 41000 38500 36600 35100 35400 33800 --- ---
9 40400 38700 41600 40400 40900 38300 36600 35300 35600 34400 --- ---
10 40300 39000 41800 40400 40600 38100 36600 35300 35300 32900 --- ---
11 40400 39000 41500 40400 39400 35700 36800 34900 34900 31100 --- ---
12 40400 39000 41500 40200 38900 34700 36600 34500 33600 30600 --- ---
13 40300 39100 41400 40100 38100 33200 36700 34700 32900 29400 --- ---
14 --- --- 41100 39900 37600 35500 37000 34300 31800 29300 --- ---
15 40600 39400 41100 39800 --- --- 36700 35000 31500 30000 --- ---
16 40700 39000 41100 39500 37200 36100 36400 34900 31300 30000 --- ---
17 40800 38800 41100 39800 37000 36200 36800 34900 31000 29500 --- ---
18 40900 39400 --- --- 36900 35800 36900 35000 30900 29400 --- ---
19 40800 39300 --- --- 37100 35600 36900 34700 30800 29600 --- ---
20 40800 39400 41600 38200 37200 35800 36900 34500 30500 29400 --- ---
21 41000 39300 41500 39300 37100 36200 37100 34700 30300 28700 --- ---
22 40800 39500 41100 39800 37100 35900 37100 34900 30200 28500 --- ---
23 40900 39100 41300 40400 37000 35700 37000 35200 29900 26700 --- ---
24 40800 39600 41500 40100 37000 35800 37200 35500 28900 23900 --- ---
25 40500 39400 42000 40100 36900 36000 37500 35000 27700 24100 --- ---
26 40500 39200 41800 40100 36800 36000 37300 35400 27300 25800 --- ---
27 40800 39500 41400 39900 36700 35800 37600 34400 27200 25600 --- ---
28 40900 39500 41400 40400 36700 35500 37700 34200 26900 25400 --- ---
29 41400 39500 41400 40600 36500 35200 37700 33800 --- --- --- ---
30 41500 39300 41500 39500 36300 35300 37500 33700 --- --- --- ---
31 41700 39300 --- --- 36300 35200 37000 34300 --- --- --- ---
MONTH --- --- --- --- --- --- 37700 33700 36900 23900 --- ---
SPECIFIC CONDUCTANCE (MICROSIEMENS/CM AT 25 DEG.C), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
(LOWER PROBE)
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH
1 --- --- 41700 39600 41600 40600 36300 35400 37300 35400 26500 25200
2 --- --- 42000 39600 41500 40400 36300 35400 37000 35500 26300 25200
3 --- --- 42100 39500 41700 39600 36600 35300 36900 35600 26200 25100
4 --- --- 42100 39300 41700 39900 36700 35400 36700 35600 --- ---
5 --- --- 41900 39000 41300 39900 36800 35500 36600 35700 --- ---
6 --- --- 42100 39300 41200 39700 36700 35500 36400 35800 --- ---
7 40500 38700 42300 39800 41100 39800 36800 35600 36200 35400 --- ---
8 40500 38700 42300 40200 41000 39900 36700 35700 35800 34900 --- ---
9 40500 38500 42100 40200 40700 40100 36700 35700 35900 34700 --- ---
10 40400 38700 42100 40300 40600 39400 36700 35700 35300 34000 --- ---
11 40500 38800 42000 41000 40300 39200 36700 35900 35100 33700 --- ---
12 40600 38800 41800 40500 39700 38300 37100 35700 34500 32400 --- ---
13 40700 39100 41700 40700 39100 37200 37300 35600 33400 31500 --- ---
14 --- --- 41600 40500 37800 36500 37400 35700 32300 30800 --- ---
15 40700 38800 41700 40400 37600 36300 37500 35800 31400 30400 --- ---
16 40800 39100 41900 40400 37600 36500 37500 35700 31200 30300 --- ---
17 40900 39100 41900 40200 37400 36400 37900 35700 30900 30000 --- ---
18 41000 39200 --- --- 37400 36100 38400 35700 30700 29800 --- ---
19 41000 39500 --- --- 37300 36300 38300 35800 30500 29800 --- ---
20 41200 39300 42100 40200 37300 36300 38400 35800 30200 29600 --- ---
21 41200 39500 42100 40200 37100 36400 38200 35800 30100 29100 --- ---
22 41300 39600 42100 40600 37100 36500 38300 35800 29900 29000 --- ---
23 41100 39600 42300 40900 36900 36400 38200 35900 29600 28700 --- ---
24 41300 39600 42200 41100 36800 36400 38000 36200 29300 28000 --- ---
25 41100 39500 42000 40900 36800 36300 38100 36000 28600 26200 --- ---
26 41100 39700 42000 41100 36700 36000 38600 35900 27200 26100 --- ---
27 41300 39700 42000 40900 36600 36100 38400 35700 27000 25500 --- ---
28 41300 39800 42100 40600 36600 36100 38300 35800 26700 25300 --- ---
29 41200 39400 42200 40800 36500 35900 38000 35700 --- --- --- ---
30 41600 39500 41900 41200 36500 35800 37700 35600 --- --- --- ---
31 41600 39700 --- --- 36400 35500 37600 35300 --- --- --- ---
MONTH --- --- --- --- 41700 35500 38600 35300 37300 25300 --- ---
TEMPERATURE, WATER (DEG. C), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
(UPPER PROBE)
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH
1 18.5 18.0 --- --- --- --- 9.5 9.0 10.5 10.0 13.0 11.5
2 18.5 17.5 --- --- --- --- 9.5 9.0 10.5 10.0 13.0 12.0
3 18.0 17.5 --- --- --- --- 9.5 9.0 10.5 10.0 13.5 12.0
4 18.0 17.0 --- --- --- --- 9.5 9.0 11.0 10.5 13.0 12.0
5 18.0 17.0 --- --- --- --- 9.5 9.0 11.0 10.5 13.5 12.0
6 --- --- --- --- --- --- 9.5 9.5 10.5 10.5 13.5 12.0
7 --- --- --- --- --- --- --- --- --- --- 12.5 12.0
8 --- --- --- --- --- --- 9.5 9.0 11.0 10.5 12.5 12.0
9 --- --- --- --- --- --- 9.5 9.0 11.0 10.5 --- ---
10 --- --- --- --- --- --- 9.5 9.0 11.0 10.5 --- ---
11 --- --- --- --- --- --- 9.5 9.0 10.5 10.0 --- ---
12 --- --- --- --- --- --- 9.5 9.0 10.5 10.0 --- ---
13 --- --- --- --- --- --- 9.5 9.5 10.5 10.0 --- ---
14 --- --- --- --- --- --- 9.5 9.5 10.5 10.0 --- ---
15 --- --- --- --- --- --- 10.0 9.5 11.0 10.0 --- ---
16 --- --- --- --- 11.0 11.0 10.0 9.5 11.0 10.5 --- ---
17 --- --- --- --- 11.5 11.0 10.5 10.0 11.5 10.5 --- ---
18 --- --- --- --- 11.5 11.0 11.0 10.0 11.0 10.5 --- ---
19 --- --- --- --- 11.5 11.0 11.0 10.0 11.5 10.5 --- ---
20 --- --- --- --- 11.0 10.0 11.0 10.5 11.0 10.5 --- ---
21 --- --- --- --- 10.5 9.0 11.0 10.5 11.0 10.5 --- ---
22 --- --- --- --- 10.0 9.0 11.0 10.5 11.5 11.0 --- ---
23 --- --- --- --- 10.0 8.5 11.0 11.0 12.0 10.5 --- ---
24 --- --- --- --- 9.5 8.5 11.0 10.5 12.0 11.0 --- ---
25 --- --- --- --- 9.5 8.5 11.0 10.5 12.0 11.0 --- ---
26 --- --- --- --- 9.0 8.5 11.0 10.5 12.0 11.0 --- ---
27 --- --- --- --- 9.0 8.5 11.0 10.0 12.0 11.0 --- ---
28 17.0 17.0 --- --- 9.0 8.5 10.5 10.0 12.5 11.5 --- ---
29 17.0 16.5 --- --- 9.0 8.5 10.5 10.0 --- --- --- ---
30 17.0 16.5 --- --- 9.0 8.5 10.5 10.0 --- --- --- ---
31 --- --- --- --- 9.5 9.0 10.5 10.0 --- --- --- ---
MONTH --- --- --- --- --- --- --- --- --- --- --- ---
TEMPERATURE, WATER (DEG. C), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
(LOWER PROBE)
DAY MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN
OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH
1 18.5 18.0 16.5 16.0 13.0 13.0 9.0 9.0 10.5 10.0 13.0 12.0
2 18.5 17.5 16.5 16.0 13.0 13.0 9.5 9.0 10.5 10.0 13.5 12.0
3 18.0 17.0 16.0 15.5 13.0 12.5 9.5 9.0 10.5 10.0 13.5 12.0
4 17.5 17.0 16.0 15.5 12.5 12.5 9.5 9.0 10.5 10.5 13.0 12.5
5 18.0 17.0 16.0 15.5 12.5 12.0 9.5 9.0 11.0 10.5 13.0 12.5
6 --- --- 15.5 15.0 12.0 11.5 9.5 9.5 10.5 10.5 13.5 12.5
7 18.0 17.5 15.5 15.0 12.0 11.0 --- --- --- --- 12.5 12.5
8 18.0 17.5 15.0 14.5 11.5 11.0 9.5 9.0 11.0 10.5 12.5 12.0
9 18.0 17.5 14.5 14.5 11.5 11.0 9.5 9.5 11.0 10.5 --- ---
10 17.5 17.0 14.5 14.0 11.0 11.0 9.5 9.0 11.0 10.5 --- ---
11 17.5 17.5 14.0 14.0 11.0 11.0 9.5 9.0 10.5 10.5 --- ---
12 17.5 17.0 14.0 13.5 11.0 11.0 9.5 9.0 10.5 10.5 --- ---
13 17.5 17.0 14.0 13.5 11.0 11.0 9.5 9.5 10.5 10.5 --- ---
14 17.5 17.0 14.0 13.5 11.0 11.0 9.5 9.5 10.5 10.5 --- ---
15 17.5 17.0 14.0 13.5 11.0 10.5 10.0 9.5 11.0 10.0 --- ---
16 17.5 16.5 14.0 13.5 11.0 11.0 10.0 9.5 11.0 10.5 --- ---
17 17.5 16.5 14.0 13.5 11.0 11.0 10.5 10.0 11.0 10.5 --- ---
18 17.0 16.5 --- --- 11.5 11.0 10.5 10.0 11.0 10.5 --- ---
19 17.5 16.5 --- --- 11.0 11.0 11.0 10.0 11.5 10.5 --- ---
20 17.5 17.0 13.5 13.0 11.0 10.0 11.0 10.5 11.0 11.0 --- ---
21 17.5 17.0 13.5 13.0 10.5 9.5 11.0 10.5 11.0 10.5 --- ---
22 17.5 17.0 13.5 13.5 10.0 9.0 11.0 10.5 11.5 11.0 --- ---
23 17.5 16.5 13.5 13.5 9.5 9.0 11.0 11.0 12.0 11.0 --- ---
24 17.0 16.5 13.5 13.5 9.5 9.0 11.0 11.0 11.5 11.5 --- ---
25 17.0 16.5 13.5 13.5 9.0 8.5 11.0 11.0 12.0 11.5 --- ---
26 17.0 16.5 13.5 13.5 9.0 8.5 11.0 10.5 12.0 11.0 --- ---
27 17.0 16.5 13.5 13.5 9.0 8.5 11.0 10.5 12.0 11.5 --- ---
28 17.0 16.5 13.5 13.5 9.0 8.5 10.5 10.0 12.5 11.5 --- ---
29 17.0 16.5 13.5 13.0 9.0 8.5 10.5 10.0 --- --- --- ---
30 16.5 16.0 13.0 13.0 9.0 8.5 10.5 10.0 --- --- --- ---
31 16.5 16.0 --- --- 9.0 9.0 10.5 10.0 --- --- --- ---
MONTH --- --- --- --- 13.0 8.5 --- --- --- --- --- ---
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