green duwamish river watershed n.
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Green- Duwamish River Watershed

Green- Duwamish River Watershed

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Green- Duwamish River Watershed

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  1. Green-Duwamish River Watershed • The Green River Watershed is the land area where rainwater drains to the Green-Duwamish River.

  2. The watershed includes Black River, Springbrook Creek, Mill Creek, Soos Creek, Jenkins and Covington Creeks, Newaukum Creek, Crisp Creek, and other tributaries.

  3. Green River Watershed Facts: • Watershed Size: 492 square miles • River Length: 65 miles from Elliott Bay to Howard Hanson Dam • Population: Approx. 400,000 • Salmon Species Present: Chinook, chum, coho, winter steelhead • Other Interesting Wildlife: Elk, black bear, cougar, bald eagle, osprey, blue heron • Number of Dams: Two - • Howard Hanson Dam, Built 1962 and • Tacoma Water Supply Diversion Dam, Built 1911

  4. Watershed words: • Headwaters: Source of a stream. • Watershed: The land from which rain collects and runs to a single point. • Groundwater: Water that lies beneath the earth's surface. • Infiltration: The slow movement of water from the surface to the groundwater. • Hydrologic: Related to water in all its forms. • Aquifer: An underground water supply flowing through rock.

  5. Historic Outlook Mid-1800s We have examined the valley of the Duwamish River and find it a fine country. There is plenty of room for one thousand travelers. Come at once." Today it is one of the most altered hydrological ecosystems in the Puget Sound basin.

  6. Historic Facts about the Green/Duwamish • 1st European settlement in King County near the mouth of the Duwamish River in 1853, • the river carried four times as much water as it does today. • To date, • 97 percent of the river's estuary has been FILLED, • 70 percent of the flows of its former watershed have been DIVERTED out of the basin and • 90 percent of the once-extensive floodplain is NOT FLOODED on a regular basis.

  7. Fill • Upper Green River Basin lies primarily in the boundaries of the Mt. Baker-Snoqualmie National Forest and has been extensively LOGGED UW

  8. Fill • Middle Green River basin has high AGRICULTURAL use -- much of the original forests and riparian zones have been cleared for pasture.

  9. Fill • Lower Green/Duwamish Basin begins at Fort Dent Park near Tukwila. A major area of DEVELOPMENT, kiro

  10. Diversion • 1907 the White River was permanently diverted into the Puyallup River The Black River was the outlet channel of Lake Washington and the Cedar River. • 1916 Ship Canal and Locks built • Lake Washington was lowered nine feet, and the Black River was cut off from the Duwamish. • Cedar River was redirected to Lake Washington

  11. Black River • 1916 Lk Washington was lowered 8.8 feet The Black River ran out of the southern end of Lake Washington. It flowed south through Renton, and then veered west and merged with the Green River to form the Duwamish River. The point where the Black River merged with the Duwamish was in Tukwila just north of present-day Southcenter Mall, near the site of Fort Dent Park.

  12. Cedar River • Until 1912, the Cedar River emptied into the Black River and became part of the Black River, which then emptied into the Duwamish. • In 1911, the Cedar River flooded Renton. The following year the town dug a 2000-foot-long, 80-foot-wide canal to reroute the course of the Cedar to the north so that it flowed directly into Lake Washington, in the hope of avoiding floods in the future. • Masonry Dam

  13. Ship Canal and Locks • link for boats between the saltwater of the Puget Sound and the fresh water of the Ship Canal connecting to Lake Union and Lake Washington. • Timber and coal transport,

  14. Development from the 1930's, 1970's and 1990's illustrating growth around Lake Meridian in the Soos Creek drainage

  15. Lake Meridian

  16. Lake Meridian

  17. Lake Meridian