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

Water quality monitoring station*

45A110 - Wenatchee R nr Leavenworth

* This station is also a flow monitoring station

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
Oxygen
9/14/2009	08:35	mg/L	9.5	8.9		6
8/13/2008	10:35	mg/L	9.5	9.1		4
8/15/2007	08:25	mg/L	9.5	9.3		2
8/14/2006	08:30	mg/L	9.5	9.4		1
8/1/2005	08:41	mg/L	9.5	8.7		8
8/2/2004	07:20	mg/L	9.5	8.5		11
9/11/2002	07:25	mg/L	9.5	9.3		2
9/4/2001	13:10	mg/L	9.5	9.2		3
8/14/2001	13:15	mg/L	9.5	9.1		5
7/10/2001	12:00	mg/L	9.5	9.4		2
8/10/1998	12:45	mg/L	9.5	8.7		8
pH
date	time	units	criterion	result	remark	% exceed
7/11/2005	09:17	pH	8.5	8.6		1
1/11/1999	12:50	pH	6.5	6.4		2
11/2/1998	13:30	pH	8.5	8.6		1
4/14/1997	12:15	pH	8.5	8.6		1
Temperature
date	time	units	criterion	result	remark	% exceed
9/14/2009	08:35	deg C	16	16.4		2
8/13/2008	10:35	deg C	16	16.1		1
8/15/2007	08:25	deg C	16	16.5		3
8/1/2005	08:41	deg C	16	18.8		18
8/2/2004	07:20	deg C	16	18.3		14
8/4/2003	10:05	deg C	16	16.5		3
9/4/2001	13:10	deg C	16	17.4		9
8/14/2001	13:15	deg C	16	21.7		36
7/10/2001	12:00	deg C	16	17.3		8
8/10/1998	12:45	deg C	16	17.6		10

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
Alkalinity
4/16/2008	10:53	mg/L	17		11.29714	1.765236	7
Ammonia-Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
8/13/2008	10:35	mg/L	0.011		0.01	1.505859E-10	18
12/13/2006	08:30	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
11/14/2006	08:45	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
10/9/2006	09:25	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
12/5/2005	08:55	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
11/7/2005	07:30	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
10/3/2005	08:31	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
12/6/2004	08:05	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
11/1/2004	08:15	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
10/4/2004	09:20	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
12/7/2003	09:27	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
11/3/2003	08:40	mg/L	0.01	U	2.183333E-02	5.841031E-03	17
10/6/2003	08:45	mg/L	0.01	U	2.911111E-02	6.016644E-03	16
12/2/2002	08:25	mg/L	0.01	U	2.911111E-02	6.016644E-03	16
11/4/2002	09:12	mg/L	0.01	U	2.911111E-02	6.016644E-03	16
10/7/2002	10:01	mg/L	0.01	U	2.911111E-02	6.016644E-03	16
10/4/1999	13:10	mg/L	0.034		0.011	0.002	16
9/6/1999	16:10	mg/L	0.033		0.011	0.002	17
7/5/1999	15:20	mg/L	0.026		0.011	0.002	17
5/10/1999	13:00	mg/L	0.029		0.013	0.004	18
10/12/1998	11:30	mg/L	0.195		0.011	0.002	16
10/14/1996	12:45	mg/L	0.141		0.011	0.002	16
Barometric Pressure
date	time	units	result	remark	QMEAN	QSD	QDP
9/11/2007	08:56	mm/Hg	735.838		718.9825	5.252055	17
12/2/2002	08:25	mm/Hg	697.23	J	719.44	7.125	18
11/4/2002	09:12	mm/Hg	693.928	J	719.44	7.125	18
10/7/2002	10:01	mm/Hg	701.04		719.44	7.125	18
5/8/2002	08:40	mm/Hg	723.9	J	715.6516	3.817551	18
Conductivity
date	time	units	result	remark	QMEAN	QSD	QDP
4/14/2009	08:33	umhos/cm	58		33.27778	6.497108	18
3/4/2009	10:12	umhos/cm	52		38.83333	4.768154	18
9/11/2007	08:56	umhos/cm	44		32.52941	5.421227	17
9/11/2006	08:25	umhos/cm	47		32.52941	5.421227	17
4/10/2006	08:45	umhos/cm	47		32.44444	6.44636	18
9/12/2005	09:15	umhos/cm	50		32.52941	5.421227	17
7/7/2003	11:50	umhos/cm	43		31.5625	5.621017	16
11/1/1999	15:25	umhos/cm	12		38.882	7.785	17
10/4/1999	13:10	umhos/cm	55		38.882	7.785	17
3/10/1997	12:35	umhos/cm	131		41.889	23.075	18
Fecal Coliform Bacteria
date	time	units	result	remark	QMEAN	QSD	QDP
6/3/2009	08:22	#/100ml	9		2.833333	2.87484	18
10/7/2008	10:20	#/100ml	19		5.222222	6.0833	18
5/8/2007	08:04	#/100ml	12		2.444444	2.478667	18
8/1/2005	08:41	#/100ml	19	J	5.294117	5.643189	17
9/13/2004	08:05	#/100ml	13	J	3.5	2.529822	16
8/2/2004	07:20	#/100ml	23	J	3.5	2.529822	16
9/8/2003	11:05	#/100ml	9		3.0625	1.982213	16
2/6/2002	09:10	#/100ml	3	J	1.25	0.577	16
1/9/2002	07:25	#/100ml	5	J	1.25	0.577	16
11/14/2001	07:45	#/100ml	10	J	1.941	1.519	17
6/5/2000	12:15	#/100ml	9		1.722	1.179	18
12/6/1999	14:40	#/100ml	59		1.941	1.519	17
6/14/1999	16:20	#/100ml	7		1.722	1.179	18
11/3/1997	10:25	#/100ml	7		1.941	1.519	17
10/13/1997	10:50	#/100ml	5		1.941	1.519	17
Flow
date	time	units	result	remark	QMEAN	QSD	QDP
7/5/1999	15:20	CFS	5440		1294.357	1350.958	14
6/14/1999	16:20	CFS	9550		4258.667	2022.371	15
11/3/1997	10:25	CFS	3660		851.143	1390.117	14
7/14/1997	10:10	CFS	5370		1294.357	1350.958	14
6/9/1997	13:30	CFS	8690		4258.667	2022.371	15
5/12/1997	09:50	CFS	9010		4258.667	2022.371	15
Nitrate+Nitrite-Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
7/9/2008	10:03	mg/L	0.033		1.372222E-02	4.836206E-03	18
5/7/2008	09:40	mg/L	0.092		5.255556E-02	1.475774E-02	18
3/19/2008	11:16	mg/L	0.03		5.416667E-02	1.153639E-02	18
Nitrate-Nitrite
date	time	units	result	remark	QMEAN	QSD	QDP
7/10/2000	12:35	mg/L	0.029		0.012	0.005	16
12/6/1999	14:40	mg/L	0.125		0.024	0.018	17
7/5/1999	15:20	mg/L	0.053		0.012	0.005	16
4/12/1999	12:15	mg/L	0.169		0.051	0.023	18
12/14/1998	12:10	mg/L	0.071		0.024	0.018	17
12/8/1997	10:30	mg/L	0.068		0.024	0.018	17
8/11/1997	10:40	mg/L	0.136		0.012	0.005	16
7/14/1997	10:10	mg/L	0.029		0.012	0.005	16
5/12/1997	09:50	mg/L	0.1		0.051	0.023	18
Oxygen
date	time	units	result	remark	QMEAN	QSD	QDP
8/2/2004	07:20	mg/L	8.5		9.808125	0.6308853	16
12/5/2000	12:50	mg/L	14.2		11.918	1.115	17
7/5/1999	15:20	mg/L	11		9.85	0.421	16
8/10/1998	12:45	mg/L	8.7		9.85	0.421	16
7/14/1997	10:10	mg/L	10.7		9.85	0.421	16
pH
date	time	units	result	remark	QMEAN	QSD	QDP
3/4/2009	10:12	pH	8.1		7.153333	0.4169638	18
7/11/2005	09:17	pH	8.6		7.508235	0.4878939	17
7/12/2004	10:39	pH	6.7		7.605	0.4209355	16
9/11/2002	07:25	pH	6.9		7.74875	0.3500643	16
8/7/2002	08:35	pH	7		7.74875	0.3500643	16
5/10/1999	13:00	pH	6.8		7.724	0.393	17
1/11/1999	12:50	pH	6.4		7.622	0.408	18
4/14/1997	12:15	pH	8.6		7.724	0.393	17
Phosphorus, Sol Reactive
date	time	units	result	remark	QMEAN	QSD	QDP
5/12/2009	09:25	mg/L	0.0041		3.205555E-03	3.857342E-04	18
4/14/2009	08:33	mg/L	0.0043		3.205555E-03	3.857342E-04	18
9/8/2003	11:05	mg/L	0.003	U	0.004625	8.062258E-04	16
8/4/2003	10:05	mg/L	0.003	U	0.004625	8.062258E-04	16
9/11/2002	07:25	mg/L	0.003	U	0.005	8.501773E-11	16
8/7/2002	08:35	mg/L	0.003	U	0.005	8.501773E-11	16
7/10/2002	07:35	mg/L	0.003	U	0.005	8.501773E-11	16
12/5/2001	07:45	mg/L	0.003	U	0.009	0.002	16
11/14/2001	07:45	mg/L	0.003		0.009	0.002	16
10/10/2001	08:10	mg/L	0.003	U	0.009	0.002	16
4/12/1999	12:15	mg/L	0.016		0.007	0.003	17
Phosphorus, Total
date	time	units	result	remark	QMEAN	QSD	QDP
4/7/2003	11:01	mg/L	0.01	U	0.3330526	2.328988E-02	19
12/2/2002	08:25	mg/L	0.011		5.483333E-02	1.122006E-02	17
11/4/2002	09:12	mg/L	0.017		5.483333E-02	1.122006E-02	17
10/7/2002	10:01	mg/L	0.01	J	5.483333E-02	1.122006E-02	17
2/9/1998	10:35	mg/L	0.04		0.014	0.009	18
11/3/1997	10:25	mg/L	0.047		0.012	0.004	16
10/13/1997	10:50	mg/L	0.042		0.012	0.004	16
9/15/1997	10:35	mg/L	0.028		0.012	0.005	16
8/11/1997	10:40	mg/L	0.029		0.012	0.005	16
5/12/1997	09:50	mg/L	0.089		0.027	0.027	18
12/9/1996	13:30	mg/L	0.724		0.012	0.004	16
Suspended Solids
date	time	units	result	remark	QMEAN	QSD	QDP
11/14/2006	08:45	mg/L	6		1.722222	1.074055	18
7/17/2006	07:56	mg/L	18		3.058824	2.04544	17
5/3/2004	08:40	mg/L	33		6.111111	5.267982	18
9/4/2001	13:10	mg/L	8	J	2.647	1.498	17
7/14/1997	10:10	mg/L	6		2.647	1.498	17
5/12/1997	09:50	mg/L	40		10.722	12.924	18
Temperature
date	time	units	result	remark	QMEAN	QSD	QDP
10/6/2003	08:45	deg C	12.5	J	5.5	2.434314	18
11/4/2002	09:12	deg C	0.1		5.5	2.434314	18
10/7/2002	10:01	deg C	11		5.5	2.434314	18
8/14/2001	13:15	deg C	21.7		14.365	2.384	17
7/5/1999	15:20	deg C	8.5		14.365	2.384	17
1/12/1998	10:00	deg C	-1.1		2.261	1.544	18
Total Persulf Nitrogen
date	time	units	result	remark	QMEAN	QSD	QDP
8/13/2008	10:35	mg/L	0.068		4.594444E-02	9.295617E-03	18
7/9/2008	10:03	mg/L	0.07		4.594444E-02	9.295617E-03	18
5/7/2008	09:40	mg/L	0.137		8.794445E-02	1.488573E-02	18
1/11/2006	09:35	mg/L	0.534		8.661111E-02	2.624531E-02	17
3/6/2001	13:21	mg/L	0.052		0.106	0.02	12
2/6/2001	11:55	mg/L	0.045		0.106	0.02	12
1/16/2001	12:25	mg/L	0.016		0.106	0.02	12
12/6/1999	14:40	mg/L	0.17		0.075	0.04	11
3/9/1998	11:00	mg/L	0.064		0.106	0.02	12
1/12/1998	10:00	mg/L	0.011	J	0.106	0.02	12
8/11/1997	10:40	mg/L	0.16		0.047	0.028	10
Turbidity
date	time	units	result	remark	QMEAN	QSD	QDP
11/14/2006	08:45	NTU	5.7		0.9611111	1.002432	18
9/13/2004	08:05	NTU	2.6		1.05	0.4993329	16
5/3/2004	08:40	NTU	5.8		2.033333	1.612816	18
11/3/2003	08:40	NTU	4.8		1.094444	1.528349	18
11/3/1997	10:25	NTU	7.1		0.772	0.453	17

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.