PROVISIONAL DATA SUBJECT TO REVISION

Station operated in cooperation with Portland Water Bureau.

 STATION.-- 14138900  NORTH FORK BULL RUN RIVER NEAR MULTNOMAH FALLS, OR

 LOCATION.--Lat 45° 29'40", long 122° 02'05", near line between SE 1/4 and SW 1/4 sec.11, 
     T.1 S., R.6 E., Multnomah County, Hydrologic Unit 17080001, Mount Hood National 
     Forest, on left bank 7.0 mi southeast of Multnomah Falls and at mouth.[location map]   
 DRAINAGE AREA.--8.32 mi2. 
 PERIOD OF RECORD.--August 1965 to current year. 
 REVISED RECORDS.--WDR OR-91-1:  1976. 
 GAGE.--Water-stage recorder.  Elevation of gage is 1,060 ft above NGVD of 1929, from 
     topographic map.  Prior to Oct. 1, 1978, and from June 13, 1989 to July 1990 (during 
     bridge construction), at site 700 ft upstream at datum 18.7 ft higher.  From 
     Oct. 1, 1978 to June 13, 1989, and July 1990 to present, site located 5 ft upstream 
     from bridge, on left bank wing wall. 
 REMARKS.--Records provisional. Regulation at times since 1958 by North Fork Reservoir, 
     capacity, about 1,030 acre-ft.  No diversion upstream from station. 
 EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,700 ft3/s, probably affected by 
     surge from release of water temporarily impounded by landslide upstream from station, 
     Jan. 20, 1972, gage height, 9.89 ft,from floodmark, from rating curve extended above 
     850 ft3/s on basis of estimate of peak flow from slope-area survey; minimum discharge, 
     8.6 ft3/s Oct. 19-29, 1987.
 EXTREME FOR FEBRUARY 1996 FLOOD.--Maximum discharge, 2,440 ft3/s Feb. 7, gage height, 
     6.11 ft; maximum gage height, 6.98 ft, Nov. 11; minimum discharge, 9.6 ft3/s Sept. ll.


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