PLATTE RIVER BASIN

06707500 SOUTH PLATTE RIVER AT SOUTH PLATTE, CO

LOCATION.--Lat 39°24'33", long 105°10'10", in SE14 sec.25, T.7 S., R.70 W., Jefferson County, Hydrologic Unit 10190002, on left bank at South Platte, 200 ft downstream from bridge on State Highway 75, and 400 ft downstream from North Fork South Platte River.

DRAINAGE AREA.--2,579 mi2.

PERIOD OF RECORD.--July 1887 to September 1891, May to October 1892, October 1895 to September 1897, October 1898 to June 1900, October 1900 to September 1982, October 2001 to current year. Monthly discharge only for some periods, published in WSP 1310. Published as "at" or "near Deansbury," "at Deansbury and Platte Canyon," "at" or "near Platte Canyon," prior to 1901, and "below North Fork, at South Platte" 1914. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06707500

REVISED RECORDS.--WSP 306: 1910. WSP 1310: 1887-91, 1893, 1896, 1900, 1904, 1915(M), 1922(M), 1936(M). WSP 1730: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 6,078.43 ft above NGVD of 1929. See WSP 1710 or 1730 for history of changes prior to Mar. 14, 1910.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by transmountain diversions through Boreas Pass ditch, Homestake Pipeline, Harold D. Roberts tunnel, and Antero and Elevenmile Canyon Reservoirs, Cheesman Lake, diversions above station for irrigation of about 45,000 acres, and return flow from irrigated areas.

COOPERATION.--Records collected and computed by Colorado Division of Water Resources and reviewed by Geological Survey.

Discharge, cubic feet per second 

WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

DAILY MEAN VALUES

DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP
1	402	249	247	e256	e205	e215	192	312	714	327	282	352
2	430	274	252	e264	e248	e211	232	295	619	300	303	526
3	363	272	246	e275	e250	e209	269	285	522	285	407	590
4	293	232	246	e255	e256	e198	272	282	478	289	392	712
5	230	234	260	e288	e250	224	254	265	524	399	374	691
6	222	230	257	e268	e226	252	228	250	506	393	366	590
7	221	232	263	e263	e215	255	214	273	488	389	402	691
8	233	318	266	e263	e240	257	202	288	459	366	426	750
9	269	291	267	e254	e246	258	202	278	413	323	428	667
10	278	289	285	e241	e270	261	273	329	413	317	379	605
11	303	283	291	e290	e258	264	409	323	422	322	376	595
12	305	238	296	e266	e248	266	391	312	417	397	427	578
13	306	248	299	e270	e271	268	378	237	422	383	415	572
14	300	253	306	e271	e281	248	439	235	431	318	404	578
15	262	250	304	e255	e257	228	369	263	402	369	399	568
16	257	240	287	e225	e247	229	340	308	395	380	396	551
17	257	240	282	e225	e246	231	335	321	399	457	416	549
18	286	237	276	e227	e251	255	329	362	509	508	423	538
19	286	231	e240	e247	e247	155	409	346	567	524	451	403
20	286	233	e221	e254	e248	159	357	354	478	476	396	399
21	286	236	e221	e251	e255	145	298	334	420	458	386	403
22	285	234	e237	e247	e250	130	300	356	388	483	396	452
23	288	250	e293	e251	e214	141	309	526	374	551	440	546
24	288	249	e231	e248	e257	161	309	481	351	450	447	512
25	286	251	e286	e233	e259	186	306	498	360	477	489	421
26	250	240	e272	e190	e262	199	319	481	360	512	504	412
27	253	250	e290	e170	e256	222	343	508	426	430	529	412
28	250	262	e251	e165	e232	197	337	589	492	462	583	409
29	252	253	e264	e164	---	160	341	600	499	445	568	395
30	243	250	e251	e153	---	160	330	648	505	411	600	419
31	244	---	e271	e238	---	172	---	670	---	304	652	---
TOTAL	8,714	7,549	8,258	7,467	6,945	6,516	9,286	11,609	13,753	12,505	13,456	15,886
MEAN	281	252	266	241	248	210	310	374	458	403	434	530
MAX	430	318	306	290	281	268	439	670	714	551	652	750
MIN	221	230	221	153	205	130	192	235	351	285	282	352
AC-FT	17,280	14,970	16,380	14,810	13,780	12,920	18,420	23,030	27,280	24,800	26,690	31,510
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1896 - 2003, BY WATER YEAR (WY)
MEAN	250	171	124	116	113	134	335	729	869	683	590	355
MAX	664	407	266	244	248	476	1,955	2,979	3,047	1,855	1,694	1,900
(WY)	(1910)	(1924)	(2003)	(2002)	(2003)	(1910)	(1942)	(1942)	(1921)	(1914)	(1914)	(1909)
MIN	61.5	49.3	45.2	45.6	36.5	52.1	98.2	180	127	85.3	81.0	81.6
(WY)	(1903)	(1905)	(1940)	(1940)	(1933)	(1957)	(1912)	(1902)	(1902)	(1902)	(1902)	(1902)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	(a) WATER YEARS 1896 - 2003
ANNUAL TOTAL	140,757	121,944
ANNUAL MEAN	386	334	373
HIGHEST ANNUAL MEAN			899 1914
LOWEST ANNUAL MEAN			119 1902
HIGHEST DAILY MEAN	748 Jun 1	750 Sep 8	6,140 Jun 7, 1921
LOWEST DAILY MEAN	167 Mar 1	130 Mar 22	b10 Dec 5, 1899
ANNUAL SEVEN-DAY MINIMUM	185 Feb 25	154 Mar 19	28 Feb 6, 1933
MAXIMUM PEAK FLOW		870 Aug 31	c6,320 Jun 8, 1921
MAXIMUM PEAK STAGE		3.82 Aug 31	8.95 Jun 8, 1921
ANNUAL RUNOFF (AC-FT)	279,200	241,900	270,100
10 PERCENT EXCEEDS	660	512	810
50 PERCENT EXCEEDS	291	288	223
90 PERCENT EXCEEDS	214	226	80

e Estimated. a Water year 1983 to 2001 data were published by Colorado Division of Water Resources. b Minimum daily determined. c From rating curve extended above 3,500 ft3/s. Flood of Jul 12, 1996 may have been higher; peak data being reviewed.