Figure 18. Channel thalweg profiles downstream of river kilometer 18, Chetco River, Oregon. (A) Channel thalweg profiles for Estuary Reach extracted from (1) bathymetric survey of 1939 (U.S. Army Corps of Engineers, 1939), (2) cross sections from 1977 flood study survey (Soil Conservation Service, 1979), and (3) bathymetric survey in 2008 by U.S. Geological Survey. (B) Channel thalweg profiles from bathymetric flood study survey in 1977 (Soil Conservation Service, 1979), and channel survey in 2008 by U.S. Geological Survey. Thalweg elevations for surveys in 1980–82 are from Oregon Department of State Lands surveys, as reported by Klingeman (1993). Upper case letters show locations of resurveyed cross sections.

Revised July 2012

First posted May 26, 2010