XC over Pk 10,707, down into chamberlain basin and contoured around to S face. Went up standard gully on left side of S face. Had steep snow in top 500 feet of gully so opted for class 3/4 climbing on steep rocks of right side of gully. Summit is awesome commanding view of Pioneers, Boulders, Smokys, Sawtooths, Salmon Rivers, and Lost Rivers. Many lakes to see. Beautiful day, 100 mile visibility and I had the entire upper mountain to myself. Went out by standard trails to 4th of July TH. Did Hyndman yesterday so I was bushed (over 10,000 vert. ft. in 2 days)! Castle proved to be tougher than expected.
Decided to trail run the trail portion which was 12-14 miles total plus the actual scramble. It was steep and the top had a good firm boulder hopping section.
Unlike the Chamberlain Basin Route, this is a scramble from the lake up. This is an easy route to get off of, and can be dangerous with lots of exposure if you do. Summited but with a lot of problems on the way (dislocated shoulder, class 4-5 stuff, etc...). It is still a truly great area with beautiful scenery. My hardest earned summit.