This is a short, but fun trail with packed singletrack that can be rode as an out and back. From the top of the ridge you can also drop into Curry Gulch and the rest of the Rattlesnake trail system.
Follow Grant Creek road 4.6 miles north of I-90 (and 0.8 miles north of the turn off to Snowbowl Ski Resort) until you reach the Ravine Trailhead.
http://www.singletracks.com/item.php?c=1&i=4684