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environmental information > river & stream WQ monitoring > state network >

Water quality monitoring station

53A070 - Columbia R @ Grand Coulee

Results that exceed water quality criteria or the usual range of data (since October, 1996)

Results that exceeded water quality standards criteria

The Department of Ecology places limits on how much pollution is allowed in our rivers to protect public health and enjoyment, and to support fish, shellfish, and wildlife (WAC 173-201A). Individual results for temperature, pH, oxygen, fecal coliform bacteria, and metals (where sampled) that are higher than these criteria are listed below. (The standards do not contain criteria for other types of water quality constituents.) This table includes only results from our monthly monitoring program. Results from other monitoring, such as continuous monitoring for temperature, are not evaluated here.

Exceeding a criterion does not necessarily mean the water quality standard has been violated. Often, other �pollution� conditions must exist for a stream segment to be in violation of water quality standards. In some cases, standards require that the source of pollution be human activities rather than natural causes. Also, more than a single result exceeding a criterion may be required.

Washington's Water Quality Standards were amended in November, 2006. Data in the tables below are based on the older standards through 2008. Data collected after 2008 are based on the ammended standards, excluding supplemental temperature criteria. We are currently working on incorporating supplemental temperature criteria into our evaluation procedures.

date	time	units	criterion	result	remark	% exceed
Fecal Coliform Bacteria (exceeding the ten percent criterion)
9/8/2003	10:50	#/100ml	200	310	J	55
Oxygen
date	time	units	criterion	result	remark	% exceed
9/14/2009	15:30	mg/L	8	7.8		3
10/6/2008	15:10	mg/L	8	7.9		1
9/10/2007	15:22	mg/L	8	7.8		3
9/14/2004	07:48	mg/L	8	7.5		6
9/8/2003	10:50	mg/L	8	7.8		2
10/14/2001	11:50	mg/L	8	7.9		1
9/9/2001	14:35	mg/L	8	7.6		5
9/15/1998	15:15	mg/L	8	7.9		1
pH
date	time	units	criterion	result	remark	% exceed
3/5/2007	14:45	pH	8.5	8.8		4
2/12/2007	14:20	pH	8.5	8.9		4
9/13/2000	18:30	pH	8.5	8.6		2
Temperature
date	time	units	criterion	result	remark	% exceed
9/14/2009	15:30	deg C	17.5	19.2		10
10/6/2008	15:10	deg C	18	19.7		9
9/8/2008	15:10	deg C	18	21.2		18
8/4/2008	16:00	deg C	18	21		17
9/10/2007	15:22	deg C	18	19		6
8/6/2007	15:35	deg C	18	19.2		7
10/2/2006	15:25	deg C	18	18.3		2
9/11/2006	12:40	deg C	18	19.8		10
8/7/2006	13:00	deg C	18	19.3		7
9/12/2005	12:20	deg C	18	19.5		8
10/4/2004	13:20	deg C	18	18.3		2
9/14/2004	07:48	deg C	18	18.8		4
10/7/2003	07:45	deg C	18	19.5	J	8
9/8/2003	10:50	deg C	18	18.6	J	3
8/4/2003	10:35	deg C	18	18.4		2
9/9/2002	16:00	deg C	18	18.6		3
9/13/2000	18:30	deg C	18	18.4		2
10/7/1998	07:00	deg C	18	18.3		2
9/15/1998	15:15	deg C	18	21.9		22
8/4/1998	15:05	deg C	18	18.9		5
9/10/1997	13:30	deg C	18	18.1		1
8/6/1997	13:20	deg C	18	20.4		13

Results that contrast strongly with historical data

Results exceeding the usual range of data (defined as 2 standard deviations beyond the mean value for a station based on data from the same three-month period over the previous six years) are shown below. A certain percentage of results will always be listed in this report. Inclusion here does not necessarily indicate something unique is occurring in the watershed.

date	time	units	result	remark	QMEAN	QSD	QDP
Ammonia-Nitrogen
7/7/2008	15:45	mg/L	0.039		1.238889E-02	5.392139E-03	18
1/7/2001	14:40	mg/L	0.025		0.013	0.004	12
10/5/1999	06:25	mg/L	0.033		0.013	0.007	12
9/15/1999	06:45	mg/L	0.032		0.016	0.007	12
8/11/1999	06:45	mg/L	0.047		0.016	0.007	12
7/14/1999	06:30	mg/L	0.051		0.016	0.007	12
5/5/1999	07:20	mg/L	0.041		0.015	0.007	12
6/9/1998	16:40	mg/L	0.029		0.015	0.007	12
5/5/1998	15:10	mg/L	0.074		0.015	0.007	12
12/4/1996	13:15	mg/L	0.033		0.013	0.007	12
Barometric Pressure
date	time	units	result	remark	QMEAN	QSD	QDP
9/14/2009	15:30	mm/Hg	716.026		730.0665	6.920965	18
7/6/2009	15:00	mm/Hg	703.072		729.5162	7.667608	18
9/14/2004	07:48	mm/Hg	736.092		723.7982	5.229575	18
8/10/2004	07:47	mm/Hg	743.458		723.7982	5.229575	18
7/13/2004	07:51	mm/Hg	737.87		723.7982	5.229575	18
12/16/2002	11:20	mm/Hg	698.5		732.4291	6.552325	17
6/3/2002	16:40	mm/Hg	712.724		729.0707	7.192044	18
4/8/2002	16:30	mm/Hg	712.724		729.0707	7.192044	18
3/11/2002	16:45	mm/Hg	711.2		735.9023	10.51051	18
Conductivity
date	time	units	result	remark	QMEAN	QSD	QDP
3/6/2006	13:10	umhos/cm	184		132.5294	19.542	17
12/10/2000	14:50	umhos/cm	92		122.25	14.913	12
9/15/1999	06:45	umhos/cm	98		124.917	11.016	12
8/11/1999	06:45	umhos/cm	95		124.917	11.016	12
7/14/1999	06:30	umhos/cm	91		124.917	11.016	12
4/7/1999	08:10	umhos/cm	189		126.667	13.076	12
3/10/1999	07:20	umhos/cm	82	J	134.25	17.062	12
2/10/1999	07:30	umhos/cm	94		134.25	17.062	12
6/4/1997	15:00	umhos/cm	99		126.667	13.076	12
2/5/1997	11:55	umhos/cm	95		134.25	17.062	12
Fecal Coliform Bacteria
date	time	units	result	remark	QMEAN	QSD	QDP
10/2/2006	15:25	#/100ml	2		1.1875	0.4031129	16
10/3/2005	14:45	#/100ml	2		1.1875	0.4031129	16
2/10/2004	08:17	#/100ml	2	J	1	0	16
9/8/2003	10:50	#/100ml	310	J	1.125	0.5	16
11/12/2002	11:10	#/100ml	2		1.125	0.341565	16
6/14/2000	19:40	#/100ml	2		1	0	12
Flow
date	time	units	result	remark	QMEAN	QSD	QDP
3/10/1999	07:20	CFS	210000		140833.3	31921.78	9
2/10/1999	07:30	CFS	218000		140833.3	31921.78	9
1/13/1999	07:05	CFS	208000		140833.3	31921.78	9
4/15/1998	14:20	CFS	40000		143966.7	41617.91	9
6/4/1997	15:00	CFS	240400		143966.7	41617.91	9
Nitrate+Nitrite-Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
12/5/2007	15:25	mg/L	0.127		8.111764E-02	2.272356E-02	17
4/2/2007	14:20	mg/L	0.267		0.1331667	6.479402E-02	18
2/6/2006	12:45	mg/L	0.253		0.1638235	2.340469E-02	17
1/9/2006	13:50	mg/L	0.096		0.1638235	2.340469E-02	17
4/13/2004	07:35	mg/L	0.269		0.1229444	5.870712E-02	18
10/7/2003	07:45	mg/L	0.046		0.1066667	2.206674E-02	18
Nitrate-Nitrite
date	time	units	result	remark	QMEAN	QSD	QDP
4/4/2000	08:45	mg/L	0.256		0.111	0.05	12
Oxygen
date	time	units	result	remark	QMEAN	QSD	QDP
1/13/2002	11:40	mg/L	10.9		12.658	0.668	12
9/9/2001	14:35	mg/L	7.6		9.617	0.801	12
6/10/2001	14:40	mg/L	10.4		12.164	0.845	11
6/14/2000	19:40	mg/L	10		12.164	0.845	11
9/15/1998	15:15	mg/L	7.9		9.617	0.801	12
6/9/1998	16:40	mg/L	10.4		12.164	0.845	11
pH
date	time	units	result	remark	QMEAN	QSD	QDP
5/7/2007	14:20	pH	8.4		7.95	0.1937251	18
4/2/2007	14:20	pH	8.4		7.95	0.1937251	18
3/5/2007	14:45	pH	8.8		7.798823	0.3710438	17
2/12/2007	14:20	pH	8.9		7.798823	0.3710438	17
9/14/2004	07:48	pH	7.3		8.065	0.2010633	18
8/10/2004	07:47	pH	7.6		8.065	0.2010633	18
7/13/2004	07:51	pH	7.6		8.065	0.2010633	18
7/8/2001	14:35	pH	7.8		8.15	0.157	12
9/13/2000	18:30	pH	8.6		8.15	0.157	12
5/10/2000	16:15	pH	8.4		7.975	0.196	12
3/7/2000	08:20	pH	6.8		7.992	0.227	12
9/15/1999	06:45	pH	7.8		8.15	0.157	12
7/14/1999	06:30	pH	7.8		8.15	0.157	12
2/10/1999	07:30	pH	7.1		7.992	0.227	12
Phosphorus, Sol Reactive
date	time	units	result	remark	QMEAN	QSD	QDP
10/3/2005	14:45	mg/L	0.003	U	4.658823E-03	6.529345E-04	17
11/1/2004	14:45	mg/L	0.0033		4.822222E-03	5.162712E-04	18
10/4/2004	13:20	mg/L	0.0031		4.822222E-03	5.162712E-04	18
3/9/2004	08:12	mg/L	0.003	U	4.647059E-03	7.746916E-04	17
2/10/2004	08:17	mg/L	0.003	U	4.647059E-03	7.746916E-04	17
1/13/2004	08:00	mg/L	0.003	UJ	4.647059E-03	7.746916E-04	17
10/7/2003	07:45	mg/L	0.0033		4.866667E-03	5.133512E-04	18
9/8/2003	10:50	mg/L	0.003	U	0.0048	5.930975E-04	18
8/4/2003	10:35	mg/L	0.0034		0.0048	5.930975E-04	18
7/7/2003	09:50	mg/L	0.003	U	0.0048	5.930975E-04	18
3/3/2003	11:15	mg/L	0.0032		4.941177E-03	4.416713E-04	17
2/3/2003	11:15	mg/L	0.0031		4.941177E-03	4.416713E-04	17
1/6/2003	11:30	mg/L	0.0037		4.941177E-03	4.416713E-04	17
3/11/2002	16:45	mg/L	0.0037		5.055556E-03	2.357023E-04	18
6/4/1997	15:00	mg/L	0.015		0.007	0.003	12
Phosphorus, Total
date	time	units	result	remark	QMEAN	QSD	QDP
3/3/1998	16:30	mg/L	0.041		0.014	0.006	12
1/6/1998	14:25	mg/L	0.029		0.014	0.006	12
8/6/1997	13:20	mg/L	0.861	J	0.083	0.245	12
4/9/1997	14:45	mg/L	0.176		0.031	0.048	12
1/15/1997	15:20	mg/L	0.03		0.014	0.006	12
Suspended Solids
date	time	units	result	remark	QMEAN	QSD	QDP
6/1/2009	14:20	mg/L	4		1.222222	0.4277926	18
9/8/2008	15:10	mg/L	2	U	1	0	18
8/4/2008	16:00	mg/L	2	U	1	0	18
3/6/2006	13:10	mg/L	2		1.176471	0.3929526	17
9/13/2000	18:30	mg/L	4		1.083	0.289	12
7/12/2000	12:55	mg/L	3		1.083	0.289	12
8/4/1998	15:05	mg/L	4	U	1.083	0.289	12
7/7/1998	14:40	mg/L	4	U	1.083	0.289	12
7/9/1997	12:50	mg/L	2		1.083	0.289	12
Temperature
date	time	units	result	remark	QMEAN	QSD	QDP
3/2/2009	14:40	deg C	6.8		3.905882	1.186629	17
9/8/2008	15:10	deg C	21.2		17.68235	1.676766	17
1/6/2003	11:30	deg C	5.8		3.276471	1.234164	17
12/16/2002	11:20	deg C	5.3		13.01667	3.510195	18
1/13/2002	11:40	deg C	6.1		2.967	1.272	12
9/15/1998	15:15	deg C	21.9		17.308	2.133	12
Total Persulf Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
7/7/2008	15:45	mg/L	0.2		0.1265	1.836957E-02	18
12/5/2007	15:25	mg/L	0.18		0.1315882	2.269377E-02	17
4/2/2007	14:20	mg/L	0.313		0.1927222	0.0590319	17
2/6/2006	12:45	mg/L	0.274		0.2022941	2.565581E-02	17
1/9/2006	13:50	mg/L	0.399		0.2022941	2.565581E-02	17
5/5/1999	07:20	mg/L	0.01	U	0.218	0.053	9
5/5/1998	15:10	mg/L	0.987		0.218	0.053	9
4/9/1997	14:45	mg/L	0.327		0.218	0.053	9
Turbidity
date	time	units	result	remark	QMEAN	QSD	QDP
8/9/2000	19:30	NTU	1.9		0.808	0.368	12
12/9/1998	06:20	NTU	1.4		0.592	0.358	12

Note: QMEAN, QSD, and QDP are the quarterly mean, standard deviation, and number of data points for the last six years, where available, for the station shown.

Washington State Department of Ecology

Data users please read disclaimer.

Questions or comments on content may be sent to Dave Hallock
Questions or comments on presentation may be sent to Steve Barrett.