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Field survey of the longitudinal profile and off-channel habitats (side channels and alcoves) of the lower Cedar River from Landsburg to Renton, WA were conducted in 2010 and 2013 respectively. The longitudinal profile is provided as an ASCII text file with fields delimited by commas. Digital maps with the locations of off-channel habitats are provided as ArcGIS shapefiles.
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Alcoves are small embayments found along a river's edge. They are found at the downstream end of gravel bars, tributary confluences, and other localized channel expansions. Alcoves generally have low velocities because they are protected from the main current, though they may "wash out" at higher flows. Alcoves are a type of off-channel habitat that are used by juvenile salmon for rearing.
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Side channels are small channels located parallel to the main channel of river that have a surface connection to the river at the upstream and/or downstream end. Connectivity may depend on river stage. Side channels are an important type of off-channel habitat for rearing of juvenile salmon and spawning by adults.
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A field survey of the lower Cedar River from Landsburg to Renton, WA was conducted on 29 April 2010 from a raft using real-time kinetic global positioning system to determine horizontal location and water surface elevation and a pressure transducer to measure depths along the thalweg of the river. These data were averaged over 100 m intervals to generate water surface elevations, river bed elevations, and depths at regular 10-meter intervals. The water surface and river bed gradients were calculated using the water surface elevations 10 m upstream and 10 m downstream of each point. Each point was assigned as a pool, riffle, or other type. Observations of salmon redds during the fall of 2010 are indicated.
    map background search result map search result map Longitudinal profile and off-channel habitats of the lower Cedar River, Washington Lower Cedar Alcoves 2013 Longitudinal profile of the lower Cedar River, Washington, 2010 Lower Cedar River Side Channels 2013 Lower Cedar Alcoves 2013 Lower Cedar River Side Channels 2013 Longitudinal profile and off-channel habitats of the lower Cedar River, Washington Longitudinal profile of the lower Cedar River, Washington, 2010