USGS Water-Year Summary for Site 06439500

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

06439500 CHEYENNE RIVER NEAR EAGLE BUTTE, SD

LOCATION - Lat 44°41'47", long 101°13'01" referenced to North American Datum of 1927, in sec.33, T.9 N., R.24 E., Haakon County, SD, Hydrologic Unit 10130105, on SD Highway 63 bridge, 23 mi south of Eagle Butte, 22.5 mi downstream from the confluence of Cherry Creek and Cheyenne River, approximately 8.1 mi upstream from Lake Oahe.

DRAINAGE AREA - 24,235 mi² of which 11 mi² probably is noncontributing. approximately.

SURFACE-WATER RECORDS

PERIOD OF RECORD - August 1928 to September 1967, March 2007 to October 2008, December 2019 to current. Monthly discharge only for some periods, published in WSP 1309. Published as "near Carlin" 1928-33.

GAGE - Water-stage recorder. Datum of gage is 1605.05 ft above North American Vertical Datum of 1988 (NAVD88). Prior to conversion to NAVD88 datum was published as 1601.57 ft above NGVD of 1929. Prior to Mar. 21, 2007 at site 0.35 miles upstream at different datum.

REMARKS - Accuracy of records for water years prior to 2021 are noted in the individual Annual Data Reports for those water years. For years 2021 onward, records good. Flows regulated by: Angostura Dam on the Cheyenne River near Hot Springs (see station 06401000) since October 1949 significantly affect peak flows; Pactola Reservoir, 25.4 mi upstream from Rapid City (see station 06411000) since June 1963; Keyhole Reservoir (see station 06427000) near Moorcroft, WY, since Oct. 25, 1952; and Belle Fourche Reservoir near Belle Fourche (see station 06435000) since May 1910. Flow also affected by diversions for irrigation of about 70,000 acres and return flow from irrigated areas. Satellite data-collection platform at station. Water temperature and specific conductance measured with each discharge measurement.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum known stage, 18.9 ft, May 13, 1920, from information by local residents. Flood of May 9, 1927, reached a stage of 18.1 ft, from information by local residents.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 104,000 ft³/s, May 24, 1933, gage height, 15.00 ft (site and datum then in use), from rating curve extended above 30,000 ft³/s; no flow Feb. 14-16, 1949, Jan. 25 to Feb. 4, 1950, Jan. 18 to Feb. 1, 1962.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Chemical analysis: Water years 1972 to 1981.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: April 2007 to October 2008 (discontinued). pH: April 2007 to October 2008 (discontinued). WATER TEMPERATURE: April 2007 to October 2008 (discontinued). DISSOLVED OXYGEN: April 2007 to October 2008 (discontinued). TURBIDITY: April 2007 to October 2008 (discontinued).

REMARKS - Data published in the tables below are rated as follows: specific conductance excellent except for October 12-16, 2007, July 28 to August 25, 2008, October 4-20, 2008 which are good, August 26 to September 6, 2008 which are fair; pH excellent except for October 1, 12-16, 2007, which are good; October 2-3, 2007 which are fair; water temperature excellent; dissolved oxygen excellent except for August 28 to September 6, 2008, which are good, October 1-3, 2007, October 12-16, 2007 which are fair; turbidity excellent except for May 6-7, 2008, June 7-19, 2008, June 21-22, 2008, and September 22 to October 7, 2008 which are good, October 12-17, 2007, June 23-24, 2008 and October 8-20, 2008 which are fair, and October 1-3, 2007, June 25 to July 1, 2008 which are poor. Daily records are collected at 15-minute intervals using multi-parameter water-quality instrument from April to November. Satellite data-collection platform at station.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 2,700 uS/cm, May 25, 28, 2007; minimum, 716 uS/cm. May 25, 2008. pH: Maximum, 8.7 standard units, June 2, 2007; minimum, 7.4 standard units, June 10, 14-15, 2007, July 30-31, 2007. WATER TEMPERATURE: Maximum, 35.0°C, July 25, 2007. DISSOLVED OXYGEN: Maximum, 13.6 mg/L, April 6, 2007; minimum, 0.0 mg/L, May 7 and August 6, 2007. TURBIDITY: Maximum, >1,830 FN units, July 24, 28-30, 2008; minimum, 4.7 FN units, October 9, 11, 2008.

EXTREMES FOR CURRENT YEAR - SPECIFIC CONDUCTANCE: Maximum, 2,460 uS/cm, April 29, 2008; minimum, 716 uS/cm, May 25, 2008. pH: Maximum, 8.5 standard units, October 17, 2007, April 24-25, 2008, May 21, 2008; minimum, 7.5 standard units, June 2, 2008. WATER TEMPERATURE: Maximum, 29.4 C, August 2, 2008. DISSOLVED OXYGEN: Maximum, 12.8 mg/L, April 25, 2008; minimum, 6.0 mg/L, July 20, 2008. TURBIDITY: Maximum, >1,830 FN units, July 24, 28-30, 2008; minimum, 7.5 FN units, September 30, 2008.