Watershed Management Plan - Mason County

Sub-basin Summaries
Appendix
A
Estimated surface water
discharge
Information for the
Hamma Hamma Sub-basin
Annual volume
(Acre-feet per
year)
461,743
Estimated groundwater seepage 8,326
Total estimated discharge 470,069
Surface water allocation 313
Groundwater allocation 376
Total allocation 689
Estimated permit-exempt well
Unknown
use
Of the 689 AF/yr of allocated water, approximately 75% is allocated for
domestic and municipal uses, with 23% allocated for irrigation. Less than
300 people live in the sub-basin (Census 2000); total estimated residential
demand is 39 AF/yr. By 2010, population in the sub-basin is expected to
decrease slightly, decreasing projected residential demand to 36 AF/yr
(Golder Associates, 2003).
Two applications for groundwater and one application for surface water are
pending in the Hamma Hamma sub-basin (Golder Associates, 2003).
WATER QUALITY
The Department of Ecology considers Fulton Creek an impaired water
body based on measured exceedances of state temperature standards.
Temperature measurements were taken near Highway 101. Ecology has
listed McDonald Creek as a water body of concern based on measurements
of temperature; however, more data are needed to determine if the Creek is
an impaired water body requiring a water clean-up plan.
HABITAT
The Hamma Hamma sub-basin supports coho, chum, cutthroat, chinook,
pink, and steelhead species. As in other sub-basins, development and
agricultural activities have resulted in degraded riparian and estuarine
habitat. In addition, elevated levels of fine sediment entering the lower
reaches of the Hamma Hamma River and John Creek are likely caused by
landslides associated with poor logging practices (WCC, 2003).
Final Plan for Adoption – April 28, 2006 page 73