PROVISIONAL DATA SUBJECT TO REVISION

Station operated in cooperation with Portland General Electric.

14141500  LITTLE SANDY RIVER NEAR BULL RUN, OR

LOCATION.--Lat 45° 24'56", long 122° 10'13", in NE 1/4 NE 1/4 sec.10, T.2 S., R.5 E., Clackamas 
 County, Hydrologic Unit 17080001, in Mount Hood National Forest, on left bank 0.25 mi upstream 
 from Portland General Electric Co. dam and tunnel from Sandy River, 3.0 mi east of Bull Run, and 
 at mile 1.95.
DRAINAGE AREA.--22.3 mi2.
PERIOD OF RECORD.--May to July 1911, October 1911 to March 1912, June 1912 to April 1913, 
 July 1919 to current year. Monthly discharge only for some periods in water years 1911-13, published 
 in WSP 1318.
GAGE.--Water-stage recorder. Elevation of gage is 720 ft above NGVD of 1929, from topographic 
 map. May 23, 1911, to Apr. 29, 1913, nonrecording gage at site 0.85 mi downstream at different datum, 
 0.5 mi downstream from Sandy River diversion tunnel. July 1, 1919, to Sept. 30, 1931, water-stage 
 recorder at site 0.1 mi downstream at different datum. Oct 1, 1931, to Nov. 3, 1967, at site 0.1 mi 
 downstream at datum 712 ft above sea level. Nov. 4, 1967, to Aug. 8, 1971, water-stage recorder at 
 site 0.1 mi downstream at datum 697.44 ft above sea level (Portland General Electric Co. bench mark).
REMARKS.--No regulation or diversion upstream from station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 5,320 ft3/s Nov. 20, 1921, gage height, 
 9.18 ft, site and datum then in use, from rating curve extended above 2,200 ft3/s; minimum 
 discharge, 8.0 ft3/s Aug. 20, Sept. 16, 17, 1940.

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