Back to the Horsetooth Mountain Ride map.
The true nature of this trail has always been something of a mystery to me. At the point where the initial service road forks off to the left, a sign marks the fork to the right as the Soderberg Trail. You ride for another 5 minutes, and the next thing you know you're passing a sign that says you're on the Spring Creek Trail.
Go figger.
This trail is pretty much an easy, middle-chainring peice of service road.