You may not know the name "Powerline Pass Trail", but you've probably been on it before.
It's often used as a sort of "trail hwy" to access other, more desirable trails. It starts at the Glen Alps trailhead. (same as the most popular hike in Alaska, Flattop: https://www.yelp.com/biz/flattop-mountain-trail-anchorage-2)
The Powerline Pass trail itself goes all the way to the actual Powerline Pass (the big mountain on your left/north is Avalanche Mountain https://www.yelp.com/biz/powerline-pass-trail-anchorage, the one on your right/south is Homicide Peak) and then goes south, towards the Turnagain Arm and ends at the Indian Trail Valley Trail (https://www.yelp.com/biz/indian-valley-trail-anchorage).
There are also various offshoots including (from Glen Alps):
Williwaw Lakes Trail (https://www.yelp.com/biz/williwaw-lakes-trail-anchorage): at about 0.5 mile, take a left, then take a left at the fork in about a mile.
O'Malley Trail (https://www.yelp.com/biz/o-malley-peak-trail-anchorage): same as above, but take a right at the fork
Hidden Lake Trail: at about 4ish miles in, take a left
Great place to use as a hub. If you just want to get out of the city and move your legs, this is a great trail to do a mile or two on. Doing it as a trail in and of itself, it's a little boring on foot. The real thrill of this trail is doing it on a mountain(or fat) bike or skis. read more