The S.R. Noteboard indicates there is a winter race at Long Lake. As far as I can tell, there are about half a dozen Long Lakes in the state of Washington.
My guess is that it is the one in Kitsap County rather than Thurston Count or the ones in eastern WA. :-)
Long Lake is in Port Orchard. From I-5 take Hwy 16 west towards Bremerton. Exit Hwy 16 at Sedgwick. Turn right. Stay on Sedgwick until you see a yellow blinking light on Long Lake Rd. (Go through two traffic signals). Turn right. Follow LL Rd, the Long Lake County Park will be on the right.