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

Field measurements, total hardness, and suspended sediment

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

[mg/L - milligrams per liter, μS/cm - microsiemens per centimeter]

Date	Time	Water Temperature (degrees Celsius)	Instantaneous Discharge (cubic meters per second)	Specific Conductance (μS/cm)	Dissolved Oxygen (mg/L)	Dissolved Oxygen, Percent of Saturation (percent)	pH (standard units)	Alkalinity (mg/L As CaCO₃)	Total Hardness (mg/L as CaCO₃)	Suspended Sediment (mg/L)
2/28/96	1210	8.6	999.7	121	11.2	96	8.00	53	48	151
3/20/96	1100	13.2	586.22	145	10.1	96	7.70	59	59	153
4/2/96	1220	12.2	368.16	160	10	93	7.80	62	63	86
5/16/96	1300	16.4	254.31	128	10.3	105	7.80	52	49	52
6/17/96	1100	17.4	320.02	119	10.4	109	7.80	50	48	59
7/16/96	1300	19.2	308.69	117	9.3	101	8.10	52	46	32
8/14/96	1030	18.5	328.51	116	9.8	104	7.80	50	44	45
9/25/96	1300	17.7	262.53	123	9.4	99	7.80	54	47	30
10/9/96	1130	18.2	200.51	133	9.4	100	7.70	64	54	36
11/14/96	1120	13.6	164.82	144	10.3	99	7.80	58	55	46
12/4/96	1030	10	207.87	150	11.1	97	8.10	66	60	27
12/16/96	1330	10.8	940.22	130	10.6	95	7.90	55		92
1/4/97	1300	10.8	1342.37	100	9.5	86	7.70	42	40	579
2/12/97	1200	9.6	671.18	139	11.4	99	7.70	58	56	105
3/13/97	1100	12.6	246.38	160	10.3	96	7.90	60	64	41
4/16/97	1240	17.7	193.71	158	10.2	107	8.10	62	65	47
5/20/97	1130	19.7	208.15	132	9.4	103	8.00	53	50	36
6/3/97	1250	18.2	238.45	121	9.4	100	7.90	48	48	37
7/31/97	1110	18.2	305.86	120	9.5	100	7.90	50	45	33
8/18/97	1120	18.6	222.88	127	9.4	100	8.00	55	53	28
9/25/97	1130	18.7	196.26	148	8.9	96	7.90	57	55	29
10/21/97	1100	16.2	122.91	151	10	102	7.80	61	58	36
11/13/97	1100	13	144.43	150	10.2	98	8.10	59	56	23
12/9/97	1100	10.2	555.07	119	10.2	90	7.70	45	45	177
1/13/98	1150	10.4	1036.51	95	10.1	90	7.80	37	40	545
2/11/98	1300	9.4	1299.89	127	11.1	96	7.80	54	52	202
3/17/98	1230	13.6	628.7	156	11	106	7.80	63	68	149
4/8/98	1130	11.8	994.03	118	11.1	102	7.90	48	51	144