Lake Isabel is a popular destination for float plane pilots, so while there is a good amount of traffic in and out, it's largely airborne; hiking here is a challenge.
Lake Isabel is only accessible via bushwhack — a logging road becomes nearly impassable for the last quarter-mile, and there is not formal trail to the lake. Hikers can expect to ford a deep and swift-flowing river, and a steep uphill bushwhack to the lake itself.
This location is not in the Forest Service's inventory of trails, and anything followed here will be a user trail. If you visit, pack out anything you bring in.