COLORADO RIVER MAIN STEM

09071750 COLORADO RIVER ABOVE GLENWOOD SPRINGS, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 39°33'32", long 107°17'25", in NW14SE14 sec.2, T.6 S., R.89 W., Garfield County, Hydrologic Unit 14010001, 0.25 mi upstream from No Name Creek and 2.0 mi above Glenwood Springs.

DRAINAGE AREA.--4,556 mi2.

PERIOD OF RECORD.--December 1985 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09071750

PERIOD OF DAILY RECORD.--

SPECIFIC CONDUCTANCE: December 1985 to current year.

WATER TEMPERATURE: December 1985 to current year.

INSTRUMENTATION.--Water-quality monitor since December 1985.

REMARKS.--Discharge obtained by subtracting the flow in Roaring Fork River at Glenwood Springs (station 09085000) from the flow in the Colorado River below Glenwood Springs (station 09085100). Water-quality data collection was moved downstream to the site downstream from No Name Creek previous site 09071100 on Dec. 12, 1985. Water-quality data collection was relocated upstream 0.25 mi above No Name Creek on Oct. 19, 1995. Water-quality data collected at this site are considered equivalent to data collected at old site. Prior to Oct. 1995, daily maximum and minimum specific-conductance data available in district office. Daily specific-conductance records are excellent except Oct. 11-26, Nov. 30 to Dec. 8, Dec. 13-18, Jan. 22 to Feb. 6, and Feb. 11 to June 10, which are good, and Nov. 27-29, Jan. 3-7, Jan. 10-18, Feb. 7-10, June 11-26, July 2-14, and minimums from Oct. 13 to Nov. 12, and Mar. 18-26, which are fair, and Dec 9-12, Dec. 19 to Jan. 2, and Jan. 8-9, 19-21, which are poor. Daily water temperature records are excellent except June 26 to July 1, and July 14-22, which are good. Interruptions in record are due to equipment malfunctions or sensor fouling.

EXTREMES FOR PERIOD OF DAILY RECORD.--

SPECIFIC CONDUCTANCE: Maximum, 1,740 microsiemens/cm, Aug. 21, 1990; minimum, 178 microsiemens/cm, June 1, 2003.

WATER TEMPERATURE: Maximum, 23.0°C, July 19, 2002; minimum, 0.0°C on many days during the winter months.

EXTREMES FOR CURRENT YEAR.--

SPECIFIC CONDUCTANCE: Maximum, 1,280 microsiemens/cm, Aug. 18; minimum, 178 microsiemens/cm, June 1.

WATER TEMPERATURE: Maximum, 22.5°C, July 25, Aug. 14, 15; minimum, 0.0°C, on many days.

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Time	Instan- taneous dis- charge, cfs (00061)	Dis- solved oxygen, mg/L (00300)	pH, water, unfltrd field, std units (00400)	Specif. conduc- tance, wat unf uS/cm 25 degC (00095)	Temper- ature, water, deg C (00010)	Residue on evap. at 180degC wat flt mg/L (70300)
OCT
23...	1125	798	10.1	8.6	963	8.0	588
NOV
12...	0945	1,020	11.2	8.3	707	3.0	418
DEC
17...	1145	517	12.5	8.4	979	1.0	584
FEB
19...	0920	741	11.6	8.3	893	2.5	529
APR
15...	0935	1,270	8.3	8.2	642	11.4	393
MAY
20...	1000	4,500	--	7.9	306	10.1	176
JUN
10...	1000	4,050	8.6	8.0	311	11.6	185
JUL
22...	1015	1,640	7.1	8.0	593	21.3	344
AUG
12...	1020	1,290	8.3	8.5	567	21.0	337

Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius 

WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

DAY	MAX	MIN	MEAN	MAX	MIN	MEAN	MAX	MIN	MEAN	MAX	MIN	MEAN
	OCTOBER			NOVEMBER			DECEMBER			JANUARY
1	---	---	---	741	729	737	969	856	889	1,010	919	967
2	---	---	---	734	669	715	883	827	850	1,000	---	---
3	---	---	---	714	632	703	898	789	823	1,020	---	---
4	---	---	---	727	699	717	898	823	849	954	890	922
5	---	---	---	---	---	---	865	815	836	935	895	915
6	---	---	---	779	732	760	876	808	835	915	869	894
7	---	---	---	793	773	781	882	816	847	968	877	916
8	---	---	---	800	754	780	917	841	876	1,030	824	921
9	---	---	---	762	742	750	928	---	---	---	855	---
10	---	---	---	750	718	729	1,010	907	979	1,060	937	990
11	863	844	851	730	716	724	1,050	957	1,010	990	931	968
12	856	816	831	731	718	723	1,150	942	1,050	943	892	925
13	854	761	824	741	724	735	1,030	953	987	945	885	908
14	872	831	864	738	724	733	1,010	919	959	946	865	914
15	882	831	872	742	719	734	1,020	963	991	955	852	913
16	887	760	853	727	716	721	1,010	960	983	1,010	---	---
17	889	845	876	736	726	732	1,030	921	976	977	878	936
18	914	865	885	793	734	760	942	897	913	997	917	951
19	950	914	932	832	788	807	952	---	---	1,060	895	968
20	956	947	951	850	831	843	---	---	---	1,080	871	967
21	961	938	951	896	849	870	---	---	---	1,030	909	972
22	967	870	943	896	870	877	996	903	951	986	897	947
23	961	902	940	910	868	884	977	883	936	926	871	907
24	939	885	922	917	890	910	---	---	---	927	882	897
25	885	860	870	917	890	904	---	---	---	912	881	899
26	874	855	865	894	837	852	---	---	---	922	897	911
27	883	764	862	1,030	862	942	---	---	---	933	887	909
28	864	822	839	1,250	1,030	1,110	---	---	---	946	888	911
29	839	805	831	1,120	948	1,000	---	---	---	941	894	910
30	805	734	763	970	902	924	990	901	948	958	895	918
31	740	726	734	---	---	---	1,000	888	947	958	875	909
MONTH	---	---	---	---	---	---	---	---	---	---	---	---
	FEBRUARY			MARCH			APRIL			MAY
1	920	891	902	916	862	894	938	889	919	497	481	487
2	922	864	893	937	831	887	903	861	883	536	497	519
3	894	866	879	935	828	890	870	816	844	570	536	556
4	939	883	900	926	815	881	816	785	792	582	561	572
5	989	883	929	923	850	878	836	779	802	561	541	547
6	995	886	930	910	822	878	879	828	842	574	543	562
7	1,060	973	1,010	919	846	888	912	848	880	608	574	593
8	1,130	978	1,040	897	846	870	925	909	920	631	608	620
9	1,140	1,000	1,070	884	851	865	909	883	893	617	593	607
10	1,040	947	987	887	846	868	883	835	858	647	557	619
11	1,030	911	951	895	823	858	847	803	821	561	522	541
12	938	871	906	863	773	818	843	775	804	601	558	589
13	871	848	856	814	756	792	792	748	764	614	595	603
14	860	833	846	779	637	713	749	689	735	603	535	571
15	843	815	823	755	645	709	689	582	637	535	448	503
16	839	803	818	802	651	723	582	559	567	448	390	419
17	851	792	824	869	802	846	621	579	598	390	326	362
18	853	826	840	896	865	879	657	621	640	326	290	311
19	949	842	878	889	870	881	663	653	660	299	282	289
20	977	880	923	890	839	869	701	662	681	291	283	288
21	1,020	863	934	917	851	902	744	701	723	297	280	288
22	974	883	915	917	840	896	751	735	746	290	266	278
23	959	913	932	878	815	849	735	662	703	274	244	259
24	987	910	935	817	782	801	662	625	634	254	230	241
25	974	880	918	789	727	768	654	625	641	239	217	227
26	919	894	909	854	759	802	674	645	663	239	220	229
27	922	897	908	859	837	846	647	577	618	226	209	216
28	909	868	893	868	852	860	582	522	561	215	199	206
29	---	---	---	902	867	884	522	489	507	206	192	197
30	---	---	---	925	902	917	489	484	486	195	182	187
31	---	---	---	937	893	922	---	---	---	200	181	186
MONTH	1,140	792	912	937	637	849	938	484	727	647	181	409
	JUNE			JULY			AUGUST			SEPTEMBER
1	190	178	183	---	---	---	597	592	595	585	557	572
2	190	180	183	505	485	496	597	574	584	582	563	574
3	206	190	195	508	479	493	574	555	565	599	576	586
4	227	206	212	508	478	493	568	543	553	603	595	599
5	244	227	234	517	495	505	550	526	535	597	557	572
6	271	244	256	543	517	528	534	524	526	570	545	558
7	292	271	282	565	541	549	547	534	544	553	540	546
8	315	292	303	575	560	565	557	541	546	551	521	542
9	325	308	316	587	567	576	572	557	565	653	537	561
10	317	265	302	569	553	559	564	559	562	590	545	561
11	305	289	296	602	538	578	566	557	562	558	531	547
12	307	292	299	610	562	584	579	565	572	560	531	546
13	311	299	306	568	554	561	592	573	583	623	560	596
14	320	304	313	567	562	565	604	579	593	623	606	613
15	330	304	316	---	---	---	784	555	597	621	598	608
16	323	308	319	---	---	---	578	563	570	618	600	611
17	342	323	334	---	---	---	588	575	583	620	615	618
18	356	341	348	---	---	---	1,280	570	731	619	595	602
19	362	346	354	---	---	---	614	488	535	597	562	569
20	366	340	353	---	---	---	531	493	502	564	556	560
21	354	341	350	---	---	---	556	531	547	568	554	563
22	373	354	365	---	---	---	566	548	559	564	556	560
23	384	361	374	616	558	593	579	563	572	562	546	550
24	391	366	382	664	609	639	622	529	565	553	542	546
25	408	382	399	670	657	665	667	503	582	548	538	543
26	421	---	---	657	605	620	663	564	595	538	495	503
27	---	---	---	606	541	568	564	550	556	501	495	497
28	---	---	---	553	536	544	560	544	553	510	500	503
29	---	---	---	551	539	547	574	560	567	511	505	508
30	---	---	---	633	547	582	575	564	571	514	507	510
31	---	---	---	598	583	591	617	567	582	---	---	---
MONTH	---	---	---	---	---	---	1,280	488	569	653	495	561

Temperature, water, degrees Celsius 

WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

DAY	MAX	MIN	MEAN	MAX	MIN	MEAN	MAX	MIN	MEAN	MAX	MIN	MEAN
	OCTOBER			NOVEMBER			DECEMBER			JANUARY
1	12.9	11.4	11.8	5.8	4.8	5.4	0.6	0.1	0.4	0.4	0.0	0.1
2	12.8	11.4	12.1	5.7	4.8	5.3	0.9	0.3	0.6	0.1	0.0	0.0
3	12.3	11.1	11.8	5.0	3.7	4.5	1.3	0.1	0.7	0.4	0.0	0.1
4	11.2	9.9	10.7	4.2	2.8	3.6	0.8	0.0	0.4	0.4	0.0	0.1
5	10.9	10.0	10.3	3.2	2.0	2.8	1.2	0.6	0.9	0.3	0.0	0.1
6	11.8	10.0	10.7	3.3	2.1	2.7	1.4	0.3	0.9	0.4	0.0	0.1
7	11.9	10.0	10.8	3.3	2.3	2.8	1.2	0.0	0.6	0.3	0.0	0.1
8	12.3	10.6	11.3	3.8	2.6	3.3	0.9	0.0	0.4	0.1	0.0	0.0
9	12.3	10.6	11.4	4.4	3.3	3.9	0.1	0.0	0.0	0.0	0.0	0.0
10	11.8	10.4	11.0	4.2	3.0	3.8	0.0	0.0	0.0	0.4	0.0	0.2
11	11.3	10.2	10.7	3.7	2.7	3.2	0.0	0.0	0.0	0.8	0.4	0.5
12	10.7	9.0	9.9	3.2	2.0	2.7	0.2	0.0	0.1	0.9	0.1	0.5
13	10.0	8.2	9.1	3.1	2.4	2.7	0.5	0.0	0.2	0.6	0.0	0.3
14	9.4	7.8	8.5	3.3	2.6	2.9	0.5	0.0	0.2	0.6	0.0	0.3
15	8.9	7.6	8.2	3.9	2.8	3.3	0.7	0.0	0.4	0.6	0.0	0.3
16	8.9	7.6	8.1	3.1	1.9	2.6	0.7	0.2	0.4	0.3	0.0	0.0
17	8.9	7.6	8.1	2.3	1.3	1.9	1.2	0.4	0.8	0.4	0.0	0.1
18	8.9	7.6	8.1	2.7	1.6	2.1	1.1	0.0	0.6	0.4	0.0	0.1
19	8.8	7.4	8.0	2.4	1.7	2.0	0.7	0.0	0.2	0.0	0.0	0.0
20	8.4	7.1	7.7	2.5	1.7	2.1	0.0	0.0	0.0	0.4	0.0	0.1
21	8.0	6.8	7.3	2.6	1.8	2.2	0.4	0.0	0.0	0.5	0.0	0.1
22	7.9	6.8	7.5	2.8	2.1	2.4	0.0	0.0	0.0	1.0	0.1	0.4
23	8.3	7.3	7.9	3.0	2.3	2.6	0.0	0.0	0.0	1.1	0.5	0.7
24	8.7	7.9	8.4	3.2	2.6	2.8	0.0	0.0	0.0	1.4	1.0	1.2
25	8.5	7.7	8.1	3.3	2.1	2.8	0.0	0.0	0.0	2.0	1.2	1.6
26	8.0	7.0	7.6	2.1	0.0	1.2	0.0	0.0	0.0	2.4	1.1	1.7
27	8.1	7.0	7.5	0.7	0.0	0.1	0.0	0.0	0.0	1.9	0.9	1.5
28	8.0	7.0	7.5	0.0	0.0	0.0	0.0	0.0	0.0	2.5	1.2	1.9
29	7.7	6.6	7.3	0.4	0.0	0.1	0.0	0.0	0.0	2.3	0.8	1.5
30	6.6	4.9	6.0	0.6	0.0	0.2	0.0	0.0	0.0	2.1	1.0	1.6
31	5.8	5.0	5.3	---	---	---	0.0	0.0	0.0	2.6	1.4	2.0
MONTH	12.9	4.9	9.0	5.8	0.0	2.6	1.4	0.0	0.3	2.6	0.0	0.6
	FEBRUARY			MARCH			APRIL			MAY
1	3.3	1.9	2.7	3.4	1.9	2.8	9.3	6.7	8.1	10.0	9.4	9.7
2	3.6	2.1	2.9	3.2	1.3	2.4	9.1	7.9	8.5	10.3	9.0	9.6
3	2.5	0.9	1.9	3.1	1.7	2.3	7.9	6.0	7.3	10.6	9.6	10.1
4	1.5	0.4	1.0	3.1	1.3	2.5	7.1	5.5	6.0	10.5	9.0	9.6
5	1.7	0.0	0.9	2.9	1.3	1.9	7.6	6.1	6.7	10.2	9.4	9.7
6	0.8	0.0	0.3	3.7	2.1	2.8	7.6	6.2	6.7	10.5	9.6	10.1
7	0.2	0.0	0.0	4.6	3.0	3.7	7.7	6.3	6.9	10.6	9.2	10.1
8	0.2	0.0	0.0	5.7	4.1	4.7	8.1	6.1	6.7	10.7	9.4	10.0
9	0.0	0.0	0.0	6.0	4.6	5.1	9.5	6.3	7.9	10.1	8.9	9.5
10	0.4	0.0	0.1	6.1	5.0	5.4	11.1	8.4	9.7	10.7	9.2	10
11	0.8	0.0	0.2	7.1	5.4	6.2	12.4	10.0	11.0	10.3	9.3	9.8
12	0.9	0.0	0.3	7.8	6.3	6.7	12.2	10.4	11.2	11.6	9.5	10.3
13	1.1	0.4	0.9	8.2	6.4	7.1	11.7	10.0	10.6	13.0	11.6	12.3
14	1.9	1.1	1.6	8.0	6.4	7.2	12.0	10.3	11.0	13.5	12.6	12.9
15	2.8	1.9	2.3	8.3	6.3	7.2	11.3	8.9	10.4	13.8	12.3	13.1
16	2.6	1.5	2.2	7.9	6.9	7.4	9.7	8.5	8.9	13.3	11.2	12.1
17	2.7	1.4	1.9	7.5	6.6	7.0	10.4	9.0	9.8	13.3	11.6	12.4
18	3.3	1.8	2.5	7.5	6.1	6.6	10.1	9.0	9.5	12.6	10.9	11.5
19	2.8	0.8	1.9	6.8	5.7	6.2	10.2	8.5	9.4	11.7	9.6	10.7
20	2.7	0.7	1.8	7.2	5.8	6.2	10.6	8.4	9.2	11.8	9.8	10.8
21	2.7	1.2	2.1	8.2	6.3	7.2	11.4	9.3	10.5	11.8	9.8	10.8
22	3.0	1.5	2.3	8.8	7.3	7.9	11.5	10.0	10.6	12.2	10.2	11.3
23	2.1	0.7	1.4	9.5	7.4	8.4	10.7	7.9	9.7	12.2	10.7	11.5
24	2.1	0.8	1.5	9.2	7.9	8.7	8.7	7.3	7.8	11.9	10.2	11.0
25	2.2	1.4	1.9	8.7	7.0	7.7	10.2	7.8	9.0	11.5	10.5	10.9
26	2.9	1.7	2.4	8.1	6.8	7.6	11.4	9.6	10.6	11.6	9.9	10.7
27	3.1	2.3	2.6	7.5	5.6	6.7	12.3	10.9	11.5	12.0	10.3	11.0
28	3.8	2.4	3.0	6.0	4.1	5.1	12.0	10.8	11.4	12.2	11.1	11.6
29	---	---	---	5.7	3.6	4.5	11.4	10.4	10.9	12.2	11.0	11.6
30	---	---	---	5.9	3.8	4.7	11.4	9.5	10.4	11.8	10.9	11.3
31	---	---	---	7.9	4.7	6.3	---	---	---	11.5	10.8	11.2
MONTH	3.8	0.0	1.5	9.5	1.3	5.7	12.4	5.5	9.3	13.8	8.9	10.9
	JUNE			JULY			AUGUST			SEPTEMBER
1	11.4	10.6	11.1	17.3	16.5	16.8	20.8	19.6	20.1	17.5	16.3	16.8
2	11.0	9.8	10.4	17.6	17.1	17.3	21.3	20.1	20.6	17.9	16.6	17.3
3	11.8	10.3	10.9	18.2	17.3	17.7	21.2	20.1	20.6	18.1	16.4	17.1
4	11.8	10.5	11.1	18.5	17.8	18.2	21.1	20.5	20.8	17.3	16.1	16.7
5	11.9	10.6	11.2	18.7	18.0	18.3	21.7	20.1	20.7	17.5	16.7	17.2
6	11.9	10.2	10.9	18.8	17.5	18.1	21.9	20.7	21.2	17.7	16.5	16.9
7	12.6	10.3	11.2	18.2	17.4	17.8	21.6	20.3	20.9	17.7	16.1	16.7
8	12.8	10.5	11.6	19.1	18.0	18.4	21.2	20.2	20.6	16.4	15.0	15.7
9	13.2	11.3	12.3	19.2	18.4	18.7	22.1	20.9	21.3	15.9	14.6	15.2
10	13.0	11.4	12.2	19.7	18.5	19.1	22.1	20.9	21.5	15.0	13.2	13.7
11	13.4	11.0	12.1	20.1	18.7	19.4	22.0	20.9	21.4	13.2	12.2	12.6
12	13.5	11.6	12.6	19.9	19.0	19.3	22.0	20.8	21.3	13.7	12.5	12.9
13	13.5	11.6	12.7	19.9	18.8	19.3	21.9	20.8	21.3	14.7	13.6	14.1
14	14.1	11.9	12.9	19.9	19.0	19.5	22.5	21.3	21.9	14.4	12.1	13.2
15	15.0	12.6	13.7	20.7	19.7	20.1	22.5	19.9	21.3	13.5	12.0	12.7
16	15.0	13.6	14.3	20.9	19.9	20.4	21.2	18.9	20.1	14.0	12.7	13.3
17	13.9	12.3	13.0	20.8	19.9	20.4	19.3	18.4	18.8	13.9	12.4	13.2
18	14.3	12.5	13.5	22.2	20.7	21.5	18.4	17.8	18.1	12.5	11.1	12.0
19	14.3	13.0	13.6	22.1	21.0	21.5	18.3	16.8	17.2	12.5	11.4	12.1
20	14.0	12.6	13.2	21.2	20.1	20.7	18.8	17.0	17.7	12.9	11.7	12.4
21	14.1	12.1	12.9	21.6	20.8	21.1	19.5	18.4	18.9	13.1	11.6	12.4
22	14.6	13.0	13.8	21.9	21.2	21.6	19.7	18.9	19.4	13.1	11.8	12.6
23	15.0	13.4	14.2	21.7	20.3	21.0	20.3	19.0	19.6	13.4	12.0	12.8
24	15.0	14.0	14.4	20.9	20.0	20.5	20.4	18.8	19.5	13.6	12.1	12.9
25	14.9	13.8	14.3	22.5	20.8	21.5	19.9	18.8	19.3	13.7	11.9	12.9
26	15.3	14.0	14.6	22.3	21.3	21.8	19.6	18.4	18.9	13.4	12.3	12.8
27	15.9	14.8	15.2	22.4	20.4	21.2	19.5	17.7	18.7	13.8	12.6	13.0
28	16.6	15.4	15.9	21.5	20.4	20.9	18.9	18.0	18.3	14.1	12.9	13.3
29	17.0	16.3	16.6	21.6	20.5	21.1	19.0	17.9	18.5	14.3	13.0	13.6
30	17.3	16.4	16.8	21.0	19.7	20.4	19.1	17.3	18.3	14.4	13.2	13.7
31	---	---	---	20.7	19.5	20.1	18.0	16.2	17.0	---	---	---
MONTH	17.3	9.8	13.1	22.5	16.5	19.8	22.5	16.2	19.8	18.1	11.1	14.1
YEAR	22.5	0.0	8.9