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From the Summit Lake parking area, hike along the trail on the east end of the lake and then veer ENE onto the Mt. Warren ridge. Initially, there's a mix of tundra, small scree & gravel. About half way up the ridge changes over to more rock with larger blocks and tundra in between. Keep walking ENE to the large, somewhat flat summit area. Our notes describe the summit as having one area of large boulders that appeared higher than any other group of boulders strew around. Walk over to that group of boulders and scramble onto the highest one for the hollow victory. Be prepared for high winds. If you're making the effort to hike this peak, it only makes sense to continue on to Rogers Peak.
Here's a couple ideas on how you can complete these two summits without having to set up a car shuttle. 1. When you complete Rogers and drop back down to the road, and hitchhike back to Summit Lake. 2. If you have two persons but one vehicle, drop one person off on the road below Rogers. Person #2 drives on up to Summit Lake and begins hiking to Warren then on to Rogers while Person #1 hikes up Rogers then continues on to Warren. Somewhere along they way they pass each other and hand off the keys to the vehicle. Person #1 arrives at Summit Lake and drives the vehicle back down to pick up Person #2. This setup can be completed in an hour and result in bagging two 13ers.
For a more "sporting" way to climb both Warren and Rogers, see the Chicago Creek/Lakes route description that starts at Echo Lake for Spaulding and Gray Wolf.