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Hamma Hamma River

Field	Value
name	Hamma Hamma River
map_size	300
pushpin_map	USA Washington
pushpin_map_size	300
pushpin_map_caption	Location of the mouth of the Hamma Hamma River in Washington
subdivision_type1	Country
subdivision_name1	United States
subdivision_type2	State
subdivision_name2	Washington
subdivision_type4	County
subdivision_name4	Mason
discharge1_location	near Eldon
discharge1_min	39 cuft/s
discharge1_avg	364.4 cuft/s
discharge1_max	6010 cuft/s
source1	Olympic Mountains
source1_coordinates
mouth	Hood Canal
mouth_coordinates

The Hamma Hamma River is a river on the Olympic Peninsula in the U.S. state of Washington. It rises near Mount Washington in the Olympic Mountains within the Olympic National Park and drains to Hood Canal and thence to the Pacific Ocean.

The name Hamma Hamma comes from a Twana village once located at the river's mouth and called Hab'hab, referring to a reed that grows along the river's banks.

At its mouth, the river splits off into to two channels which feed into the Hood Canal and create a marsh. There are two bridges that cross these parts and marsh called the North and South Hamma Hamma Bridges respectively.

Near the river, you can find the Hamma Hamma Balds Natural Area Preserve.

Geology

The Hamma Hamma River begins deep within the Olympic Mountains, cutting through steep ridges that rise dramatically from sea level to over 6,000 feet. Flowing northeast between Mt. Ellinor and Mt. Washington, it carves one of the few major valleys that breach the mountain front before descending toward Hood Canal.

The river’s course is shaped by parallel ridges that direct its drainage and that of nearby streams like the North Fork Skokomish. Glacial activity during the Pleistocene greatly altered its path, leaving behind gravel plains, marshes, and smaller creeks that now feed into it as it winds toward the sea.

Proposed Projects

Hamma Hamma Hydroelectric Project

The Draft Environmental Impact Statement for the Hamma Hamma Hydroelectric Project, prepared in 1985 by the U.S. Federal Energy Regulatory Commission, evaluated a proposed hydroelectric development on the Hamma Hamma River in Mason County, Washington. The report analyzed potential impacts on fish, wildlife, water quality, sediment transport, and other environmental factors, along with possible environment protection measures and project alternatives.

The document was part of the federal licensing process under the Federal Power Act and was intended to inform agencies, stakeholders, and the public about the environmental consequences of the proposal. As a draft, it did not represent final approval or guarantee that the project would be constructed.[[File:Geologic Map of the Lake Cushman and Hamma Hamma Area.png|thumb|Geologic Map of the area]]

'''Locations of the proposed hydroelectric projects within the Hamma Hamma River Basin'''

References

"Historical data, water years 1951-1971, for USGS gage 12054500, Hamma Hamma River near Eldon, WA". [[USGS]].
{{GNIS. 1531459. Hamma Hamma River
Phillips, James W.. (1971). "Washington State Place Names". University of Washington Press.
"North Hamma River Bridge".
https://intranet.ess.uw.edu/content/people/student_publications_files/robinson--john-w/Robinson_1938.pdf Retrieved 2025-11-10
United States. (1985). "Hamma Hamma hydroelectric project: environmental impact statement.".

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

rivers-of-washington-(state) rivers-of-mason-county,-washington

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