To get to the trailhead for the Birch Creek To Rock Creek Trail, follow US15 to Apex exit north of Dillon and follow Birch Creek Road to Birch Creek Ranger Station. This 17 mile mountain bike ride starts from the ranger station.
This mountain bike ride takes in 3 of the main drainages in this area It is a tong mountain bike ride but will give a good appreciation of the scenery of the Eastern Pioneers.
Ride back onto Birch Creek and follow it to Willow Creek, which is followed to the end where Trail #120 to Agnes Lake via Rainbow Lake is found on the right, follow #120 through the woods and down to Agnes.
From Agnes descend towards Rock Creek on #122 down a steep rocky patch. After 1/3 mite the trail crosses a mining road, take this mining road to the left and head down and through the tungsten mine which cuts into the hillside. Exit the far side of the mine and continue down to cross a bridge across Rock Creek. Now, follow Rock Creek Road down to Browns Lake which ties on the right, finish here.
Overall, Birch Creek To Rock Creek Trail is the 29th most popular mountain bike trail of all 63 mountain biking rides in Idaho.