Gross Reservoir Expansion Project will impact recreation
Construction for the Gross Reservoir Expansion Project has started. Since March 14, there has been no public access to the following Gross Reservoir recreation areas and amenities on the south side of the dam. This will continue through the duration of the project:
- Osprey Point boat launch.
- Osprey Point trailhead.
- The Inlet Trail.
- Miramonte picnic area.
- Windy Point picnic area.
- South Side picnic area.
- Scenic overlook.
On-water access (starting the Friday of Memorial Day weekend) and parking will be relocated to the North Shore. Additionally, a full closure to recreation for 2 to 3 weeks in May will prepare for enhanced access to the north side for the upcoming boating season. After this, the North Shore and South Boulder Creek Trail (below the dam) will remain open to the public throughout the project.
Access to the Winiger Ridge campground will remain largely unchanged until tree removal activities begin in 2025. Visitors will be able to access hiking, fishing, picnicking and nonmotorized boating (overnight camping permitted only at Winiger Ridge) amenities from these locations.
Please note, these areas may be subject to intermittent closures during the Gross Reservoir Expansion Project to maintain public safety. Portions of Gross Reservoir for nonmotorized boating may also be closed to the public via surface water buoy lines.
Anticipated Recreation Access Impacts During Construction
Named for Denver Water former Chief Engineer Dwight D. Gross, the reservoir was completed in 1954. It serves as a combination storage and regulating facility for water that flows under the Continental Divide through the Moffat Tunnel. Standing 340 feet above the South Boulder Creek streambed, the current Gross Dam contains some 627,559 cubic yards of concrete. Once construction is complete, the dam will stand 417 feet and contain about 1.5 million cubic yards of concrete.
By the numbers