PLATTE RIVER BASIN

06721000 SOUTH PLATTE RIVER AT FORT LUPTON, CO

LOCATION.--Lat 40°06'58", long 104°49'05", in SW14SE14 sec.19, T.2 N., R.66 W., Weld County, Hydrologic Unit 10190003, on right bank 2 ft downstream from county road 18 bridge, 3.0 mi downstream from Big Dry Creek, and 2.5 mi north of Fort Lupton.

DRAINAGE AREA.--5,044 mi2 (revised). Area at 1957 gage location is 5,007 mi2 (revised).

PERIOD OF RECORD.--May to September 1906, April 1929 to September 1957, April to September 2003 (seasonal records only). Prior to October 1933 monthly discharge only, published in WSP 1310. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06721000

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 4,860 ft above NGVD of 1929, from topographic map. Oct. 3, 1947 to Sept. 30, 1957, water-stage recorder at site 3.9 mi upstream at different datum. See WSP 1730 for history of changes prior to Oct. 3, 1947.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow affected by transmountain diversions, storage reservoirs, ground-water withdrawals, diversions for irrigation, and return flow from irrigated areas. Several measurements of specific conductance and water temperature were obtained and are published in the "Supplemental Water-Quality Data for Gaging Stations" section of this report.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,000 ft3/s, April 26, 1942, from rating curve extended above 6,700 ft3/s; maximum gage height, 7.57 ft, May 9, 1957, site and datum then in use; minimum daily, 4.4 ft3/s, October 29, 1956.

EXTREMES FOR CURRENT YEAR (seasonal only).--Maximum discharge during period April to September, 3,210 ft3/s, May 11, gage height, 7.52 ft; minimum daily, 101 ft3/s, Aug. 22.

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	---	---	---	---	---	---	---	681	1,610	530	229	638
2	---	---	---	---	---	---	---	545	1,750	518	242	398
3	---	---	---	---	---	---	---	465	1,590	584	191	449
4	---	---	---	---	---	---	---	416	1,420	460	183	300
5	---	---	---	---	---	---	---	330	1,360	312	267	226
6	---	---	---	---	---	---	---	237	1,290	348	267	213
7	---	---	---	---	---	---	---	197	1,570	405	162	212
8	---	---	---	---	---	---	---	191	1,120	405	166	260
9	---	---	---	---	---	---	---	209	853	242	474	212
10	---	---	---	---	---	---	---	1,520	812	182	199	186
11	---	---	---	---	---	---	---	2,000	859	262	158	164
12	---	---	---	---	---	---	---	1,220	906	266	341	184
13	---	---	---	---	---	---	---	884	887	242	328	175
14	---	---	---	---	---	---	---	705	855	235	265	173
15	---	---	---	---	---	---	---	524	836	225	263	178
16	---	---	---	---	---	---	---	561	866	246	198	174
17	---	---	---	---	---	---	---	429	846	247	147	164
18	---	---	---	---	---	---	---	517	1,560	222	147	172
19	---	---	---	---	---	---	---	634	1,290	753	306	174
20	---	---	---	---	---	---	---	560	1,080	361	187	181
21	---	---	---	---	---	---	---	464	1,000	288	127	178
22	---	---	---	---	---	---	---	365	e845	287	101	179
23	---	---	---	---	---	---	---	280	754	283	104	177
24	---	---	---	---	---	---	---	260	714	260	124	170
25	---	---	---	---	---	---	---	311	685	235	141	165
26	---	---	---	---	---	---	---	445	606	157	129	163
27	---	---	---	---	---	---	---	443	494	230	171	161
28	---	---	---	---	---	---	---	495	384	270	185	165
29	---	---	---	---	---	---	457	606	356	304	193	171
30	---	---	---	---	---	---	653	881	518	567	772	169
31	---	---	---	---	---	---	---	1,440	---	332	2,110	---
TOTAL	---	---	---	---	---	---	---	18,815	29,716	10,258	8,877	6,531
MEAN	---	---	---	---	---	---	---	607	991	331	286	218
MAX	---	---	---	---	---	---	---	2,000	1,750	753	2,110	638
MIN	---	---	---	---	---	---	---	191	356	157	101	161
AC-FT	---	---	---	---	---	---	---	37,320	58,940	20,350	17,610	12,950

e Estimated.