Siena Reservoir Trail is a 1.2 mile lightly trafficked loop trail located near Broomfield, Colorado that features a lake and is good for all skill levels. The trail is primarily used for mountain biking and is accessible from March until November. Dogs are also able to use this trail but must be kept on leash.
dogs on leash
There is a trailhead at Siena Reservoir so that no surface road riding is necessary. There's no shade on the trail, but lots of picnic sites with shaded tables for resting.