PROVISIONAL DATA SUBJECT TO REVISION

Station operated in cooperation with the U.S. Army Corps of Engineers and the city of Salem.

14183000 NORTH SANTIAM RIVER AT MEHAMA, OR

LOCATION.--Lat 44° 47'20", long 122° 37'00", in NW 1/4 sec.18, T.9 S., R.2 E., Marion County, 
   Hydrologic Unit  17090005, on right bank 300 ft downstream from highway bridge at Mehama, 
   0.5 mi downstream from Little North Santiam River, and at mile 38.71.
DRAINAGE AREA.--655 mi2, at cableway 0.8 mi downstream.
PERIOD OF RECORD.--July 1905 to March 1907, October 1910 to September 1914, September 1921 to 
   current year. Monthly discharge only September 1921, published in WSP 1318. Prior to 
   October 1913, published as North Fork of Santiam River at Mehama.
GAGE.--Water-stage recorder.  Datum of gage is 602.49 ft above NGVD of 1929. Prior to 
   June 15, 1933, nonrecording gage at site 100 ft upstream at same datum.
REMARKS.-- Flow regulated since 1953 by Detroit Lake (station 14180500) and Big Cliff Reservoir, 
   usable capacity for reregulating purposes, 2,930 acre-ft. No diversion upstream from station.  
   All records given herein are for measuring site. Continuous water-quality records for the 
   period April 1985 to September 1986 have been collected at this location.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 76,600 ft3/s Dec.  28, 1945, gage 
   height, 15.37 ft, from rating curve extended above 36,000 ft3/s, on basis of slope-area 
   measurement of peak flow; maximum gage height, 17.5 ft Nov.  20, 1921, from graph based on 
   gage readings, and Jan.  6, 1923, from floodmark, at site then in use; minimum discharge, 
   254 ft3/s Aug. 3, 1970; minimum daily, 420 ft3/s Sept. 18, 1924.

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