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Elwha-Morse Watershed

Assessment Document

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An Assessment of Available Data and Information and Possible Methods of Analysis of the Water Resources of the Elwha-Morse Watershed, Washington


Lower Elwha Klallam Tribe members taking Elwha River measurements. Photo by Dallas Childers USGS Lower Elwha Klallam Tribe members taking Elwha River measurements. Photo by Dallas Childers USGS

The Water Resource Inventory Area (WRIA) 18 Planning Unit is developing a watershed plan to maintain reliable supplies of clean water for population and economic growth and a healthy aquatic habitat, based on the State of Washington's Watershed Management Act (RCW 90.82/ ESHB 2514). Water-resource and related data and information are needed to develop the plan and will also be needed for making water-resource management decisions for the study area when the dams on the Elwha River are removed.

The objectives of this document are to briefly describe the data and information needed to assess the water resources of the Elwha-Morse Watershed, to summarize available hydrologic data and data gaps, and to describe possible methods of analysis to obtain the needed data and information. This document is organized by the four watershed components in ESHB 2514 - water quantity, water quality, habitat, and instream flows. In ESHB 2514, technical assessments are required for water quantity, and assessments are optional for the other three components. The emphasis of this document, therefore, is on water quantity, but there is also some information on the other components.

Full Text--You can read the full text as a Microsoft Word document

Table 1. General summary of possible methods of analysis, data, and information needed to conduct technical assessments of the Elwha-Morse Watershed area (WRIA 18). MS Excel
Table 2. Summary of precipitation and temperature at weather stations within the Elwha-Morse Watershed. MS Excel
Table 3. Available USGS streamflow data for continuously gaged streams and peak flow measurements in the Elwha-Morse Watershed. MS Word
Table 4. List of reference numbers, streams, and locations of miscellaneous streamflow measurements made by the USGS, beginning 1898, for the Elwha-Morse Watershed. MS Word
Table 5. List of miscellaneous streamflow measurements in the Elwha-Morse Watershed, made by the USGS. MS Excel
Table 6. Selected well data from the USGS database for wells located in the Elwha-Morse Watershed. MS Word
Table 7. Summary of well data obtained from the Elwha River-Morse Creek web page. MS Word
Table 8. Available water-quality data for streams in the Elwha-Morse Watershed. MS Word
Table 9. Available water-quality data for ground water in the Elwha-Morse Watershed. MS Word

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