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Chetco River Gravel Transport Study


Project Description

Location map for Chetco River study
Location map for Chetco River study

The Chetco River is a steep, gravel-bed river in southwestern Oregon that drains 914 km2 (354 mi2) of the rugged Klamath Mountains before emptying into the Pacific Ocean 5 km (3.1 mi) north of the California-Oregon border. The lower 18 km (11.2 mi) of the channel is a wandering gravel bed river flanked by abundant, large gravel bars.

The U.S. Army Corps of Engineers and other agencies charged with permitting instream gravel extraction in Oregon requested that the USGS conduct studies to characterize channel processes and gravel transport on the Chetco River and to also evaluate possible effects of gravel extraction on physical channel and aquatic habitat conditions. The study area for this project spans the lower 18 km (11.25 mi) of the Chetco River corridor, including the USGS streamflow gage at river kilometer 16.9 (river mile 10.7) and the extent of commercial gravel extraction.

In 2009, the USGS completed a comprehensive study of gravel transport and storage along the lower Chetco River. The objectives of the study were to:

  1. Determine the annual influx of bed-material sediment. Description of the sediment transport calculations and a table of influx estimates for 1970-2008 can be found HERE.
  2. Evaluate spatial and temporal variation in bed-material transport rates.
  3. Assess planform and vertical changes to the river channel.
  4. Provide digital maps of floodplain geomorphology and general vegetation conditions for different time periods.

The U.S. Army Corps of Engineers has also requested that the USGS provide ongoing technical assistance to support the adaptive management of gravel resources in the Chetco River corridor. The adaptive management tasks for 2009–2011 are:

  1. Compute the annual influx of bed-material sediment at the USGS streamflow gage at river kilometer 16.9:
    • A recently published report summarizing the influx calculations can be downloaded HERE
    • Description of the influx calculations for this period can be found HERE.
  2. Measure bedload discharge at the USGS streamflow gaging station at river kilometer 16.9 (river mile 10.7).
    • Measurement data from sampling trips made in December 2010 and March 2011 will be published later in 2011.

Publications


Chetco River near USGS streamflow gaging station at River Kilometer 17
Chetco River near USGS streamflow gaging station
at River Kilometer 17 (River Mile 11)

Reports from this project can be viewed at the USGS publications warehouse or can be directly downloaded below.

Suggested citation:

Wallick, J.R., and O'Connor, J.E., 2011, Estimation of bed-material transport in the lower Chetco River, Oregon, water years 2009–2010: U.S. Geological Survey Open-File Report 2011–1123, 12 p.

Wallick, J.R., Anderson, S.W., Cannon, Charles, and O’Connor, J.E., 2010, Channel change and bed-material transport in the lower Chetco River, Oregon: U.S. Geological Survey Scientific Investigations Report 2010–5065, 68 p.


Data Availability

The digital channel maps developed for this study are available for download.  Please be aware that these GIS layers are considered provisional data, and are subject to change as the study is completed.  Metadata describing the map layers is available for each of the datasets.

PROVISIONAL DATA (Subject to change):

Download geodatabase [ZIP, 128 Mb]
Download metadata [ZIP, 116 Kb]
Download 2008 bathymetric survey metadata [PDF, 41 Kb]

Need PDF Reader? Get it Here

 

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Page Last Modified: Monday - Dec 12, 2016 at 19:13:59 EST