I hiked Glenn Alps to Williwaw Lake on Sunday May 23rd. The Chugach Hike book lists it as 8-9 miles but I think that is if you go up and over the Ballpark. The signpost leading off the Powerline Trail shows 5 miles making it about 11 miles rt from the parking lot. It took the dog and I 5 hours roundtrip.
The section below Little Omalley is very wet and muddy. There are plastic mats to prevent you from sinking to your knees but take good waterproof hiking boots. I just had trail runners on and had wet feet for the next 5 hours. Off trail is softer so stick to the mats in most places. The snow crossings had been previously post-holed by hikers making it easier to find solid footing. Great hike and very similar scenery to Rabbit Lake. Between the two I'd choose Rabbit Lake for the drier trail. But, Nothing wrong with this hike.
Leave the parking lot and turn right when you hit the Power Line trail then drop down to the bridge.
There's alot more Mt. Redoubt ash in the mountains then we got in town.
Still some ice on Williwaw Lake on May 23rd