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

Methylmercury in unfiltered water

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

[µg/L - micrograms per liter, < - less than]

Date	Time	Methylmercury in unfiltered water (ng/L)
2/28/96	1210	0.076
3/20/96	1100	0.08
4/2/96	1220	0.065
5/16/96	1300	0.102
6/17/96	1100	0.093
7/16/96	1300	0.1
8/14/96	1030	0.079
9/25/96	1300	0.061
10/9/96	1130	0.091
11/14/96	1120	0.416
12/4/96	1030	<0.02
1/4/97	1300	0.384
2/12/97	1200	1.265
3/13/97	1100	0.444
4/16/97	1240	0.288
5/20/97	1130	0.272
6/3/97	1250	0.246
7/31/97	1110	0.075
8/18/97	1120	0.102
9/25/97	1130	0.146
10/21/97	1100	0.125
11/13/97	1100	0.102
12/9/97	1100	0.170
1/13/98	1150	0.462
2/11/98	1300	0.08
3/17/98	1230	0.077
4/8/98	1130	0.109
5/13/98	1220	0.073
6/10/98	1100	0.046