Where are Measurements Made? - USGS Water Quality of SF Bay

Water Quality of San Francisco Bay

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Where are Measurements Made?

In order to describe water quality along the longitudinal axis of the San Francisco Bay-Delta system, we collect measurements at 39 fixed sampling locations spaced 3-6 kilometers apart. These sampling stations are located along the central deep channel, from the southern limit of South Bay, through Central Bay, San Pablo Bay, Carquinez Strait, Suisun Bay, and ending at Rio Vista on the Sacramento River.

The table below describes the location, latitude, longitude, and water depth (at mean low water) for each station :

A text version of the table is also available.

Station Number	General Location	North Latitude	West Longitude	Depth MLW (meters)
657	Rio Vista	38° 8.9'	121° 41.3'	10.1
655	N. of Three Mile Slough (non-standard)	7.3'	42.1'	10.1
653	Mid-Decker Island (non-standard)	6.3'	43.2'	10.1
649	Sacramento River	3.7'	48.0'	10.1
2	Chain Island	3.8'	51.3'	11.3
3	Pittsburg	3.0'	52.7'	11.3
4	Simmons Point	2.9'	56.1'	11.6
5	Middle Ground	3.6'	58.8'	9.8
6	Roe Island	3.9'	122° 2.1'	10.1
7	Avon Pier	2.9'	5.8'	11.6
411	Garnet Sill (non-standard)	5.8'	3.5'
407	Reserve Fleet 4 (non-standard)	4.3'	5.6'
405	Reserve Fleet 2 (non-standard)	2.9'	7.4'
8	Martinez	1.8'	9.1'	14.3
9	Benicia	3.0'	10.4'	34.4
10	Crockett	3.6'	12.5'	17.7
11	Mare Island	3.7'	15.8'	15.5
12	Pinole Shoal	3.1'	18.7'	8.8
12.5	Pinole Point (non-standard)	2.4'	18.9'	6.7
13	N. of Pinole Point	1.7'	22.2'	9.8
14	"Echo" Buoy	0.4'	24.3'	13.1
15	Point San Pablo	37° 58.5'	122°26.2'	22.9
16	"Charlie" Buoy	54.9'	26.8'	12.8
17	Raccoon Strait	52.9'	25.6'	32.0
18	Point Blunt	50.8'	25.3'	43.0
19	Golden Gate	49.1'	28.3'	91.0
20	Blossom Rock	49.2'	23.6'	18.2
21	Bay Bridge	47.3'	21.5'	17.4
22	Potrero Point	45.9'	21.5'	18.0
23	Hunter's Point	43.7'	20.2'	20.1
24	Candlestick Point	41.9'	20.3'	11.0
25	Oyster Point	40.2'	19.5'	8.8
26	San Bruno Shoal	38.1'	18.8'	9.8
27	San Francisco Airport	37.1'	17.5'	13.0
28	N. of San Mateo Bridge	36.1'	16.2'	16.2
28.5	Geo Probe (non-standard)	35.8'	14.1'	15.7
29	S. of San Mateo Bridge	34.8'	14.7'	14.6
29.5	Steinberger Slough (non-standard)	34.1'	13.1'	14.6
30	Redwood Creek	33.3'	11.4'	12.8
31	Coyote Hills	31.7'	9.5'	13.7
32	Ravenswood Point	31.1'	8.0'	12.8
33	Dumbarton Bridge	37° 30.5'	122° 7.3'	11.6
34	Newark Slough	29.7'	5.6'	7.9
35	Mowry Slough	28.8'	4.8'	8.5
36	Calaveras Point	28.3'	3.9'	7.9

NOTES:

Non-standard stations were not sampled on a regular basis over the course of the water quality project

August 1999 through January 2002 stations 5-7 were not sampled. Instead, Suisun Bay was sampled at stations 405, 407 and 411. Data from these stations are included in the data tables and database but are excluded from the data plots.


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