Gross Reservoir

Owned and Operated by Denver Water
Recreation Managers:
Denver Water: east side manager
Roosevelt National Forest/Boulder District: west side manager
Reservations: Day use area
Elevation: 7,282 feet (2,220 meters) — spillway
Capacity: 41,811 acre feet (one acre foot = 325,851 gallons)
Denver Water: 303-634-3641
U.S. Forest Service Boulder District: 303-541-2500
Boulder Sheriff: 303-441-3624
Colorado Parks and Wildlife: 303-291-7227


From Denver-metro area:

  • Take Highway 93 north from Golden to Highway 72
  • Turn left (west) on Highway 72 toward Pinecliffe to County Road 77/Gross Dam Road
  • Gross Dam Road will take you to both the north and south access points

From Boulder:

  • Take Flagstaff Road west until it turns into eastern Gross Dam Road

Seasonal Information

  • Open year-round.
  • Boating (car-top non-motorized only) season starts on the Friday of Memorial Day weekend and ends Sept. 30.
  • Kokanee snagging runs from Sept. 1 – Jan. 31.
  • West site U.S. Forest Service closes from late fall to early spring: check with the U.S. Forest Service Boulder district for specific closure dates.

Operating Hours

Sunrise to sunset.

Recreation Opportunities

Map (PDF 2.86 MB)

  • Fishing: Cold water fishing; stocked by Colorado Parks and Wildlife.
  • Ice fishing: Ice fishing when conditions permit. Denver Water does not monitor ice conditions and those entering the ice should be aware of changing ice conditions and proceed at their own risk.
  • Canoeing, kayaking: Boating is allowed (car-top non-motorized only) on the Friday of Memorial Day weekend through Sept. 30. No trailer-hitched boats are allowed. Kayak access to the river below Gross Reservoir is available at the parking area below the dam.
  • Picnicking: The east side developed areas are for day use only. Sheltered tables also available.
  • Camping: Limited access. High clearance vehicles required. West side managed by Roosevelt National Forest. Area has seasonal closure; check with Boulder District.
  • Hiking: Hiking is permitted from North Shore picnic area (trailhead to Rocky Point), South Side Dam, Miramonte picnic area, and Osprey Point (trailhead), to South Boulder Creek inlet.

Note: Water contact sports such as swimming, wading, scuba diving or other water activities are prohibited.