Water-Quality Assessment of the Sacramento River
Basin, California: Water-Quality, Sediment and Tissue
Chemistry, and Biological Data, 1995-1998
(Open-File Report 2000-391)

Sacramento River at Colusa, California

Mercury in unfiltered water

Number of significant figures do not reflect analytical method reporting levels.

[ng/L - nanograms per liter]

Date	Time	Mercury in unfiltered water (ng/L)
2/28/96	1210	10.41
3/20/96	1100	7.75
4/2/96	1220	4.57
5/16/96	1300	6.43
6/17/96	1100	3.54
7/16/96	1300	2.71
8/14/96	1030	1.97
9/25/96	1300	2.06
10/9/96	1130	3.21
11/14/96	1120	1.70
12/4/96	1030	2.59
1/4/97	1300	105.16
2/12/97	1200	12.12
3/13/97	1100	4.74
4/16/97	1240	3.57
5/20/97	1130	5.28
6/3/97	1250	4.14
7/31/97	1110	2.91
8/18/97	1120	3.20
9/25/97	1130	2.79
10/21/97	1100	4.01
11/13/97	1100	2.22
12/9/97	1100	17.63
1/13/98	1150	43.53
2/11/98	1300	21.37
3/17/98	1230	15.15
4/8/98	1130	13.89
5/13/98	1220	8.93
6/10/98	1100	9.07