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

Water quality monitoring station

35B060 - Tucannon R @ Powers

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)
5/6/2009	12:40	#/100ml	200	350		75
4/8/2009	13:20	#/100ml	200	220		10
9/9/2003	09:25	#/100ml	200	850	J	325
11/7/2001	10:00	#/100ml	200	220		10
8/8/1999	13:15	#/100ml	200	250		25
7/5/1998	13:45	#/100ml	200	670		235
5/3/1998	14:10	#/100ml	200	220		10
6/1/1997	13:50	#/100ml	200	4500	J?	2150
Oxygen
date	time	units	criterion	result	remark	% exceed
7/8/2009	14:30	mg/L	8	7.5	J	6
8/8/1999	13:15	mg/L	8	7.9		1
pH
date	time	units	criterion	result	remark	% exceed
9/16/2009	13:20	pH	8.5	8.6		1
9/10/2008	12:00	pH	8.5	9.1		7
4/9/2008	13:15	pH	8.5	8.8		4
10/15/2002	13:05	pH	8.5	8.6		2
8/8/2000	16:10	pH	8.5	8.7		2
7/11/2000	12:40	pH	8.5	8.7		2
4/11/2000	11:50	pH	8.5	8.7		2
9/12/1999	14:10	pH	8.5	8.9		5
4/4/1999	15:35	pH	8.5	8.6		1
8/2/1998	15:10	pH	8.5	9		6
4/13/1998	13:25	pH	8.5	8.6		1
3/1/1998	15:25	pH	8.5	8.7		2
10/5/1997	13:30	pH	8.5	8.6		1
9/7/1997	15:10	pH	8.5	9		6
8/3/1997	14:40	pH	8.5	8.7		2
7/6/1997	13:30	pH	8.5	8.6		1
Temperature
date	time	units	criterion	result	remark	% exceed
9/16/2009	13:20	deg C	17.5	18.8		7
8/5/2009	13:00	deg C	17.5	22		26
7/8/2009	14:30	deg C	17.5	20.1		15
8/6/2008	12:45	deg C	18	21.7		21
7/10/2007	09:32	deg C	18	20.4		13
8/15/2006	09:57	deg C	18	18.3		2
8/2/2005	08:51	deg C	18	19.1		6
7/12/2005	10:00	deg C	18	19.6		9
8/4/2004	09:31	deg C	18	19.3		7
7/14/2004	09:10	deg C	18	18.5		3
8/5/2003	09:45	deg C	18	20.1		12
7/8/2003	08:50	deg C	18	18.2		1
8/14/2002	08:40	deg C	18	18.2		1
7/17/2002	08:40	deg C	18	20.1		12
8/8/2001	08:35	deg C	18	18.5		3
7/11/2001	09:20	deg C	18	20.5		14
9/12/2000	16:25	deg C	18	19.9		11
8/8/2000	16:10	deg C	18	23		28
7/11/2000	12:40	deg C	18	19.8		10
8/8/1999	13:15	deg C	18	19.6		9
7/11/1999	13:00	deg C	18	20.7		15
9/13/1998	15:10	deg C	18	21.6		20
8/2/1998	15:10	deg C	18	24.9		38
7/5/1998	13:45	deg C	18	21.9		22
9/7/1997	15:10	deg C	18	19		6
8/3/1997	14:40	deg C	18	25.3		41
7/6/1997	13:30	deg C	18	21.3		18

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
7/8/2009	14:30	mg/L	0.015		1.044444E-02	1.885618E-03	18
6/4/2008	12:10	mg/L	0.014		1.022222E-02	9.42809E-04	18
11/2/2004	09:15	mg/L	0.018		1.022222E-02	9.42809E-04	18
9/12/1999	14:10	mg/L	0.032		0.015	0.008	12
8/8/1999	13:15	mg/L	0.06		0.015	0.008	12
7/11/1999	13:00	mg/L	0.043		0.015	0.008	12
6/1/1997	13:50	mg/L	0.121		0.024	0.033	11
2/2/1997	13:10	mg/L	0.034		0.015	0.008	12
Barometric Pressure
date	time	units	result	remark	QMEAN	QSD	QDP
1/7/2009	12:50	mm/Hg	725.17		746.5906	10.24074	18
9/12/2007	08:45	mm/Hg	751.078		737.6378	6.12818	18
8/13/2007	09:30	mm/Hg	755.904		737.6378	6.12818	18
7/10/2007	09:32	mm/Hg	750.062		737.6378	6.12818	18
5/7/2007	09:05	mm/Hg	757.936		739.1735	7.36659	18
9/12/2006	09:00	mm/Hg	754.38		737.6378	6.12818	18
7/18/2006	08:55	mm/Hg	753.11		737.6378	6.12818	18
5/9/2006	10:00	mm/Hg	758.19		739.1735	7.36659	18
12/6/2005	09:05	mm/Hg	768.096		743.0648	8.584876	18
9/13/2005	10:00	mm/Hg	752.856		737.6378	6.12818	18
8/2/2005	08:51	mm/Hg	753.11		737.6378	6.12818	18
7/12/2005	10:00	mm/Hg	752.348		737.6378	6.12818	18
4/5/2005	09:12	mm/Hg	758.698		739.1735	7.36659	18
6/16/2004	09:25	mm/Hg	756.666		737.8761	6.153765	18
12/17/2002	09:25	mm/Hg	722.63		746.5364	6.186827	18
8/14/2002	08:40	mm/Hg	728.98		741.3532	4.915243	18
6/5/2002	09:10	mm/Hg	729.488		742.6337	6.179796	18
4/10/2002	09:33	mm/Hg	728.472		742.6337	6.179796	18
2/13/2002	11:45	mm/Hg	729.996		748.036	6.69	11
Conductivity
date	time	units	result	remark	QMEAN	QSD	QDP
7/8/2009	14:30	umhos/cm	130		156.3889	12.35808	18
7/9/2008	12:20	umhos/cm	114		156.3889	12.35808	18
6/4/2008	12:10	umhos/cm	77		106.4737	13.68847	19
8/8/2001	08:35	umhos/cm	185		154	13.545	12
7/11/1999	13:00	umhos/cm	107		154	13.545	12
6/6/1999	12:45	umhos/cm	70		121.167	18.502	12
8/2/1998	15:10	umhos/cm	313		154	13.545	12
Fecal Coliform Bacteria
date	time	units	result	remark	QMEAN	QSD	QDP
5/6/2009	12:40	#/100ml	350		65.22222	43.85881	18
4/8/2009	13:20	#/100ml	220		65.22222	43.85881	18
6/11/2007	10:00	#/100ml	150		47.22222	34.33667	18
6/7/2005	07:00	#/100ml	120	J	47.22222	34.33667	18
4/5/2005	09:12	#/100ml	120	J	47.22222	34.33667	18
9/9/2003	09:25	#/100ml	850	J	148.8889	144.6683	18
3/13/2002	08:50	#/100ml	180	J	43.05556	36.84861	18
1/16/2002	09:10	#/100ml	160	J	53.727	38.696	11
6/1/1997	13:50	#/100ml	4500	J?	437.167	1280.777	12
Flow
date	time	units	result	remark	QMEAN	QSD	QDP
8/8/1999	13:15	CFS	203		62.667	20.688	9
7/11/1999	13:00	CFS	215		62.667	20.688	9
6/6/1999	12:45	CFS	515		220	114.913	9
7/6/1997	13:30	CFS	143		62.667	20.688	9
5/4/1997	13:25	CFS	507		220	114.913	9
2/2/1997	13:10	CFS	1080		309.091	287.747	11
Nitrate+Nitrite-Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
5/6/2009	12:40	mg/L	0.429		0.1115	8.658709E-02	18
4/8/2009	13:20	mg/L	0.915		0.1115	8.658709E-02	18
1/7/2009	12:50	mg/L	0.945		0.4390556	0.1828582	18
6/4/2008	12:10	mg/L	0.307		0.1115	8.658709E-02	18
5/7/2008	12:30	mg/L	0.685		0.1115	8.658709E-02	18
4/9/2008	13:15	mg/L	0.309		0.1115	8.658709E-02	18
3/5/2008	12:30	mg/L	0.876		0.4390556	0.1828582	18
2/13/2008	12:45	mg/L	1.06		0.4390556	0.1828582	18
2/6/2007	08:10	mg/L	0.707		0.422	0.139427	18
1/9/2007	09:20	mg/L	0.977		0.422	0.139427	18
12/12/2006	09:04	mg/L	0.446		0.2146111	9.468532E-02	18
4/11/2006	08:34	mg/L	0.34		9.744444E-02	6.427443E-02	18
Nitrate-Nitrite
date	time	units	result	remark	QMEAN	QSD	QDP
4/6/1997	13:40	mg/L	1.17		0.392	0.336	11
Oxygen
date	time	units	result	remark	QMEAN	QSD	QDP
8/5/2009	13:00	mg/L	8.6		9.674444	0.5319246	18
7/8/2009	14:30	mg/L	7.5	J	9.674444	0.5319246	18
3/4/2009	11:47	mg/L	15		12.36278	0.4695781	18
9/10/2008	12:00	mg/L	12.4		9.674444	0.5319246	18
10/10/2007	12:40	mg/L	9.7		11.66167	0.7867151	18
4/10/2007	09:12	mg/L	13.1		10.80611	0.8189961	18
9/13/2005	10:00	mg/L	11		9.472222	0.7273607	18
2/14/2001	08:25	mg/L	14		12.1	0.736	12
12/13/2000	09:00	mg/L	13.2		11.542	0.749	12
9/12/1999	14:10	mg/L	11.4		9.292	0.592	12
8/8/1999	13:15	mg/L	7.9		9.292	0.592	12
6/6/1999	12:45	mg/L	9		10.55	0.679	12
4/4/1999	15:35	mg/L	12.4		10.55	0.679	12
6/7/1998	16:00	mg/L	9		10.55	0.679	12
pH
date	time	units	result	remark	QMEAN	QSD	QDP
9/10/2008	12:00	pH	9.1		8.115	0.1832469	18
6/4/2008	12:10	pH	7.7		8.022632	0.1600987	19
4/9/2008	13:15	pH	8.8		8.022632	0.1600987	19
1/15/2008	12:30	pH	8.2		7.95	0.1033871	19
11/6/2007	12:20	pH	8.5		8.085556	0.1896195	18
8/14/2002	08:40	pH	7.8		8.532778	0.3432681	18
7/17/2002	08:40	pH	7.8		8.532778	0.3432681	18
3/14/2001	08:45	pH	8.2		7.667	0.253	12
3/14/2000	11:30	pH	8.2		7.667	0.253	12
3/1/1998	15:25	pH	8.7		7.667	0.253	12
1/12/1997	16:35	pH	7		7.667	0.253	12
Phosphorus, Sol Reactive
date	time	units	result	remark	QMEAN	QSD	QDP
8/5/2009	13:00	mg/L	0.061		3.974444E-02	9.902717E-03	18
7/8/2009	14:30	mg/L	0.0644		3.974444E-02	9.902717E-03	18
6/3/2009	14:00	mg/L	0.0488		3.377222E-02	7.068223E-03	18
5/6/2009	12:40	mg/L	0.0528		3.377222E-02	7.068223E-03	18
4/8/2009	13:20	mg/L	0.0788		3.377222E-02	7.068223E-03	18
5/7/2008	12:30	mg/L	0.0558		3.377222E-02	7.068223E-03	18
8/13/2007	09:30	mg/L	0.028		4.729445E-02	8.287373E-03	18
5/7/2007	09:05	mg/L	0.019		3.501111E-02	5.498758E-03	18
8/15/2006	09:57	mg/L	0.023		4.729445E-02	8.287373E-03	18
4/11/2006	08:34	mg/L	0.0496		3.501111E-02	5.498758E-03	18
8/2/2005	08:51	mg/L	0.025		4.729445E-02	8.287373E-03	18
11/2/2004	09:15	mg/L	0.024		4.457222E-02	9.664173E-03	18
9/13/2004	08:18	mg/L	0.0323		0.04915	6.929328E-03	18
11/2/1997	16:20	mg/L	0.066		0.038	0.01	12
6/1/1997	13:50	mg/L	0.095		0.039	0.021	12
Phosphorus, Total
date	time	units	result	remark	QMEAN	QSD	QDP
8/8/1999	13:15	mg/L	0.146		0.072	0.028	12
2/7/1999	14:25	mg/L	0.484		0.132	0.089	12
11/2/1997	16:20	mg/L	0.154		0.078	0.035	12
4/6/1997	13:40	mg/L	0.396		0.146	0.124	10
3/2/1997	13:45	mg/L	0.374		0.132	0.089	12
Suspended Solids
date	time	units	result	remark	QMEAN	QSD	QDP
9/16/2009	13:20	mg/L	14		6.055555	2.182072	18
8/5/2009	13:00	mg/L	12		5.444445	2.306569	18
7/8/2009	14:30	mg/L	21		5.444445	2.306569	18
6/3/2009	14:00	mg/L	54		15.16667	7.671567	18
5/6/2009	12:40	mg/L	390		15.16667	7.671567	18
4/8/2009	13:20	mg/L	600		15.16667	7.671567	18
1/7/2009	12:50	mg/L	72		18.83333	25.32901	18
6/4/2008	12:10	mg/L	95		15.16667	7.671567	18
5/7/2008	12:30	mg/L	183		15.16667	7.671567	18
12/3/2007	13:20	mg/L	10		4.777778	2.602161	18
6/1/1997	13:50	mg/L	2180		215.583	619.169	12
2/2/1997	13:10	mg/L	1880		220.833	525.699	12
Temperature
date	time	units	result	remark	QMEAN	QSD	QDP
8/5/2009	13:00	deg C	22		17.58889	2.116292	18
2/4/2009	12:45	deg C	9.1		5.561111	1.742594	18
1/7/2009	12:50	deg C	9.8		5.561111	1.742594	18
10/8/2008	14:10	deg C	15		8.466666	2.618037	18
10/10/2007	12:40	deg C	13.9		8.466666	2.618037	18
1/10/2006	10:13	deg C	0		5.222222	1.459474	18
12/6/2005	09:05	deg C	0		7.877778	3.571382	18
3/8/2005	09:09	deg C	9.6		5.222222	1.459474	18
9/11/2002	09:00	deg C	14.7		20.63889	2.637097	18
11/15/2000	08:35	deg C	1.6		9.1	3.695	12
Total Persulf Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
5/6/2009	12:40	mg/L	0.528		0.2075	8.952637E-02	18
4/8/2009	13:20	mg/L	1.07		0.2075	8.952637E-02	18
1/7/2009	12:50	mg/L	1.09		0.5308333	0.1901842	18
9/10/2008	12:00	mg/L	0.08		0.2161667	6.480128E-02	18
6/4/2008	12:10	mg/L	0.413		0.2075	8.952637E-02	18
5/7/2008	12:30	mg/L	0.806		0.2075	8.952637E-02	18
4/9/2008	13:15	mg/L	0.432		0.2075	8.952637E-02	18
3/5/2008	12:30	mg/L	0.979		0.5308333	0.1901842	18
2/13/2008	12:45	mg/L	1.13		0.5308333	0.1901842	18
1/9/2007	09:20	mg/L	1.07		0.5257222	0.1855332	18
8/15/2006	09:57	mg/L	0.097		0.2548889	0.0737762	18
4/11/2006	08:34	mg/L	0.449		0.1992222	6.756222E-02	18
Turbidity
date	time	units	result	remark	QMEAN	QSD	QDP
9/16/2009	13:20	NTU	3.3		1.611111	0.6772686	18
8/5/2009	13:00	NTU	3.1		1.527778	0.6994162	18
6/3/2009	14:00	NTU	18		4.601	3.042613	20
5/6/2009	12:40	NTU	190		4.601	3.042613	20
4/8/2009	13:20	NTU	260		4.601	3.042613	20
6/4/2008	12:10	NTU	50		4.601	3.042613	20
5/7/2008	12:30	NTU	60		4.601	3.042613	20
2/6/2007	08:10	NTU	180		21.97895	53.82365	19
4/11/2006	08:34	NTU	16		5.161	3.03348	20
6/1/1997	13:50	NTU	1700	J	148.7	488.562	12
2/2/1997	13:10	NTU	550		74.408	154.588	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.