PROVISIONAL DATA SUBJECT TO REVISION

Station operated in cooperation with the Confederated Tribes of the Warm Springs Reservation.

STATION.--14087400  CROOKED RIVER BELOW OPAL SPRINGS, NEAR CULVER, OR
LOCATION.--Lat 44° 29'33", long 121° 17'50", in NW 1/4 NE 1/4 sec.33, T.12 S., R.12 E., 
Jefferson County, Hydrologic Unit 17070305, on right bank 0.2 mi downstream from Opal 
Springs, 4.8 mi southwest of Culver, and at mile 6.7.
DRAINAGE AREA.--4,300 mi2, approximately, of which 500 mi2 is probably noncontributing.
PERIOD OF RECORD.--October 1961 to current year.
GAGE.--Water-stage recorder. Datum of gage is 1,953.60 ft above NGVD of 1929 (Portland 
General Electric Co. bench mark).
REMARKS.--Flow regulated since December 1960 by Prineville Reservoir, active capacity of 
152,800 acre-ft and Ochoco Reservoir, active capacity, 46,500 acre-ft. Dam and powerplant 
0.3 mi upstream, completed in 1985, causes brief fluctuations in flow. Many diversions 
for irrigation upstream from station. Practically all of the summer flow comes from Opal 
Springs and other springs within 15 mi upstream from station. Simultaneous records (1961-63) 
at former gaging station 5.6 mi downstream indicated over 15  percent increase to summer flow 
from springs downstream from this station. Continuous water-quality records for the period 
October 1963 to September 1974 have been collected at this location.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,660 ft3/s Dec. 24, 1964, gage height, 
9.36 ft; minimum daily discharge, 1,090 fts3/s May 11, 1981, minimum instantaneous discharge 
after October 1989, 656 ft3/s many days in the 1990 water year, prior to that date minimum 
instantaneous discharge was not determined.

NOTE: The most current shifted rating for this site can be found at USGS Rating Depot website.