Dillon Reservoir is a large mountain reservoir in Summit County, Colorado, situated at approximately 9,017 feet elevation along the Interstate 70 corridor between the towns of Dillon, Frisco, and Silverthorne. Surrounded by fourteener peaks and nestled among six major ski resorts, this reservoir serves as both a drinking water supply for Denver and one of the most popular year-round recreation destinations in the Colorado high country. Whether you are driving I-70 and need a scenic pit stop or planning a full weekend of mountain activities, Dillon Reservoir delivers panoramic Rocky Mountain views from every angle.
Biking ranks among the top activities at Dillon Reservoir. A roughly 20-mile paved bike path loops the entire shoreline, connecting the Dillon Marina to Frisco Marina with several scenic overlooks along the way. Reviewers describe the ride as challenging due to climbs over Swan Mountain, with one visitor reporting a five-hour completion time for the full loop. E-bike rentals are available for those who want the scenery without the full cardio effort. Running and walking are equally popular on the same trail network, with benches and picnic tables spaced along the route.
Boating and paddleboarding draw crowds throughout summer. Pontoon boat rentals are available at the marina, and guided two-hour boat tours offer a relaxed way to experience the reservoir from the water. Paddleboarding is a favorite among locals. Water skiing is not permitted on Dillon Reservoir, as multiple reviewers confirm the restriction. The Dillon Marina area includes a dock, a playground for children, and walkable access to restaurants, drinks, and ice cream shops in the town of Dillon.
Fishing at Dillon Reservoir targets trout and the rare arctic char, an uncommon species that inhabits the deep, cold water. Shoreline access varies; one reviewer recommends entering through School Drive near Dillon for quick access to the water with minimal walking. However, fishing reviews are mixed, with some visitors reporting small trout and slow bites compared to other Colorado fisheries. The reservoir formerly held gold medal fishing status.
Winter transforms the reservoir into a frozen landscape. Visitors walk on the frozen surface, and ice skating is available in nearby towns. The surrounding area provides access to Copper Mountain, Keystone, Breckenridge, Arapahoe Basin, Vail, and Beaver Creek ski resorts, making Dillon Reservoir a convenient base camp for ski season. The Dillon Amphitheater hosts live bands and Fourth of July events on the lakefront during summer.
Water levels fluctuate seasonally. In late summer, high water can cover the shoreline and limit waterfront access in many spots. Weather at 9,000 feet is unpredictable, with snow, rain, sunshine, and hail sometimes occurring in the same day. Altitude sickness is a concern for visitors arriving from lower elevations. Free parking is available at the dam, and the area is dog-friendly with on-leash rules enforced on trails.