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 37 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 standard station:
Station
Number |
General Location |
North
Latitude |
West
Longitude |
Depth MLW
(meters) |
|---|
| 657 | Rio Vista | 38° 8.9' | 121° 41.3' | 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 |
| 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 |
| 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 |
| 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 |
| 29 | S. of San Mateo Bridge | 34.8' | 14.7' | 14.6 |
| 29.5 | Steinberger Slough | 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 |
Non-standard stations were sampled historically on an irregular basis, the table below describes their location, latitude, longitude, and water depth (at mean low
water) when known:
Station
Number |
General Location |
North
Latitude |
West
Longitude |
Depth MLW
(meters) |
|---|
| 662 | | 38° 13.6' | 121° 40.2' | 10.1 |
| 659 | | 10.7' | 140.0' | 10.1 |
| 655 | N.sof Three Mile Slough | 7.3' | 42.1' | 10.1 |
| 654 | | 6.3' | 42.5' | |
| 653 | Mid-Decker Island | 6.3' | 43.2' | 10.1 |
| 652 | | 5.2' | 44.8' | |
| 651 | | 4.7' | 45.8' | |
| 650 | | 4.3' | 46.5' | |
| 411 | Garnet Sill | 5.8' | 3.5' | |
| 407 | Reserve Fleet 4 | 4.3' | 5.6' | |
| 405 | Reserve Fleet 2 | 2.9' | 7.4' | |
| 12.5 | Pinole Point | 2.4' | 18.9' | 6.7 |
| 19 | Golden Gate | 37° 49.1' | 122° 28.3' | 91.0 |
| 28.5 | Geo Probe | 35.8' | 14.1' | 15.7 |
NOTE: 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.
|
U.S. Department of the Interior |
U.S. Geological Survey
