Abstract:SummaryThe Grays River Watershed and Biological Assessment was funded to address degradation and loss of spawning habitat for chum salmon (Onchorhynchus keta) and fall Chinook salmon (Onchoryhnchus tshawytscha). In 1999, the National Marine Fisheries Service listed lower Columbia River chum salmon as a threatened Evolutionarily Significant Unit (ESU) under the Endangered Species Act of 1973 (ESA). The Grays River watershed is one of two remaining significant chum salmon spawning locations in this ESU. Runs of … Show more
“…A study in a similar forest type on a smaller river in the Pacific Northwest, which measured individual sloughs and not catchment-scale metrics and therefore cannot be directly compared with our results, found variation among sloughs even within the same region (Hood 2002). Further, virtually the entire Grays River watershed has been logged leading to an unstable sediment supply that influences current conditions (May and Geist 2007). In the absence of knowledge regarding historical equilibrium conditions, the hydraulic geometry of reference swamps existing in and responsive to the current environmental matrix may provide the most suitable model for restoration design.…”
Section: G6 Discussionmentioning
confidence: 62%
“…Sediment accretion rates will be important to the prediction of restoration trajectories in the region. Although there is evidence of highly increased sediment mobilization in upper portions of the Grays River catchment as a result of logging and human activities, and dramatic channel movements in the lower river where our study sites occur (May and Geist 2007), over-dike flows with the potential for sediment deposition on the study site occurred only on a limited basis associated with large winter floods of the Grays River during the 20th century. In the two years following hydrologic reconnection, the mean sediment accretion measured in six locations was 2.4 cm/yr, substantially greater than the historical levels measured by radiocarbon dating.…”
Section: G61 Floodplain Elevations and Flowsmentioning
This report is the fourth annual report of a seven-year project (2004 through 2010) to evaluate the cumulative effects of habitat restoration actions in the 235-km-long Columbia River estuary. The project is being conducted for the U.S.
“…A study in a similar forest type on a smaller river in the Pacific Northwest, which measured individual sloughs and not catchment-scale metrics and therefore cannot be directly compared with our results, found variation among sloughs even within the same region (Hood 2002). Further, virtually the entire Grays River watershed has been logged leading to an unstable sediment supply that influences current conditions (May and Geist 2007). In the absence of knowledge regarding historical equilibrium conditions, the hydraulic geometry of reference swamps existing in and responsive to the current environmental matrix may provide the most suitable model for restoration design.…”
Section: G6 Discussionmentioning
confidence: 62%
“…Sediment accretion rates will be important to the prediction of restoration trajectories in the region. Although there is evidence of highly increased sediment mobilization in upper portions of the Grays River catchment as a result of logging and human activities, and dramatic channel movements in the lower river where our study sites occur (May and Geist 2007), over-dike flows with the potential for sediment deposition on the study site occurred only on a limited basis associated with large winter floods of the Grays River during the 20th century. In the two years following hydrologic reconnection, the mean sediment accretion measured in six locations was 2.4 cm/yr, substantially greater than the historical levels measured by radiocarbon dating.…”
Section: G61 Floodplain Elevations and Flowsmentioning
This report is the fourth annual report of a seven-year project (2004 through 2010) to evaluate the cumulative effects of habitat restoration actions in the 235-km-long Columbia River estuary. The project is being conducted for the U.S.
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