Kachess Ridge Loop Professional Review and Guide
"You'd never guess it from the first 5.9 miles of the loop, but the Kachess Ridge loop is a steep, challenging, advanced-level ride with a strenuous 5.3 miles of climbing (4.8 miles on the road and another 0.5 mile to start the trail) and an exhilarating 6.2-mile descent through meadows, across creeks and loose rocks, down some tight switchbacks and to beautiful.
The trail access is unmarked as well. If you're an advanced rider, don't let it deter you; it's really pretty straightforward, and definitely worth the effort. By the time the trail is rideable you'll encounter dusty trail in some sections, and some wet trail in other sections as you parallel and cross Silver Creek. A rugged trail with rugged scenery makes for an advanced, rugged ride. Please be a trail-conscious rider and walk your bike where appropriate."