10/25, Bear Creek Mussels - indicators of stream health

The photo above is one of the world's most sensitive "biological indicators" of natural resource health -- and it lives in our very own "back yard" -- Bear Creek. It's a 50-year old, middle-aged, freshwater mussel. Good luck trying to find it in the stream bed!

Did you know that 70% of all freshwater mussels in the U.S. are at risk or endangered? Freshwater mussels need fish to reproduce (their larva develop in fish gills) so their survival in Bear Creek is very dependent on salmon - another endangered species. Thus, mussels are very sensitive indicators of the condition of our local water quality and the health of our salmon fisheries.

Some alarming news was announced at a WATER TENDERS meeting last night. We learned that Bear Creek mussels have experienced a catastrophic decline -- a 93% mortality in the last year. But so far, in preliminary studies, experts from University of Washington and King County could not fully explain WHY.

The experts could not attribute the decline to water quality, sedimentation, urbanization, or even "first flush" of stormwater from roads. Toxic algae blooms, disease, and predation are more likely but even these causes have been ruled out for the time being. The experts have just begun their studies so with further study answers & solutions may be found.

These creatures have lived in "our back yard creek" for over 2000 years. Snoqualmie Indians once lived off the mussels and left large piles of shells (middens) on campsites along the banks of Bear Creek and Cottage Lake Creek.

How much longer will these historic creatures live in 'our neighborhood'? Right now, it doesn't look too good for them.