http://www.backpacker.com/trips/colorado/denver/denver-co-beaver-brook/#bp=0/img1
4 (Stay straight at this 3-way junction with the Chavez Trail. This flat, signed section of trail follows the river for a few minutes and rolls over a rocky face before turning right, uphill and into the woods.)
3 (Bear left just before the picnic area and descend a steep set of steps. This marks the end of the nature trail and the beginning of the Beaver Brook Trail. Look for red and white blazes marking the way.)
1 (Though relatively low elevations make this trail accessible much of the year, the road is closed below this point during winter. Expect to trek an additional 0.6 mile if the main trailhead is off limits.)
2 (Follow either branch of the Nature Trail downhill from the trailhead. The upper branch is dotted with interpretive signs, but both lead downhill to the beginning of Beaver Brook.)