the elevation may indicate that it wasn't one of the snoqualmie area golden lakes. I believe I've been to the one you've mentioned (twice as well, in fact) and actually hooked my first golden but lost him. I was actually quite a bit further north (Hwy 20) and decided against the boulder field because it was about 500 vertical feet of large, snow-covered boulders and I was alone and figured a few trout and bloody cold wasn't worth the risk involved.
If we're talking about the same lake, my recent diagnosis is that some of the goldens have now hybridized with the cutts in the lake. Last August I caught a very westslope looking GT and about five minutes later caught a very standard looking westlope cutt. I proposed this to the regional biologist who confirmed it as a possibility as there is a fair amount of natural repro. in the lake. Who knows...
Tomorrow another lower lake will be investigated. Hopefully some good results will be reported.