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Flatiron Reservoir

This quiet, 47-acre reservoir is surrounded by 200 acres of public lands. It's a popular spot for fishing, picnicking, and family camping. Swimming and boating are not allowed here, but nearby Carter Lake offers both!

As part of the Colorado-Big Thompson Project to divert water from the west slope to the east slope for drinking water, irrigation, and hydropower generation, the reservoir is jointly operated by the Bureau of Reclamation and the Northern Colorado Water Conservancy District who manage water levels for irrigation, municipal, and industry use. Larimer County manages recreation.

Flatiron Reservoir requires entrance and camping permits, and is open year round. At 5,470 feet in elevation, it is a few miles northwest of Carter Lake, southwest of Loveland, Colorado, and northwest of Berthoud, Colorado.

General Regulations

For specifics, ask a ranger for a copy of the Regulations Brochure.
  • No boating allowed.
  • Swimming is prohibited except at the swim beach at Carter Lake at Dam 2.
  • No access to the southeast side, or the dam, due to Homeland Security restrictions.
  • Quiet hours are 10 p.m. to 6 a.m.
  • Collection of firewood, including cutting of trees and branches is not allowed.
  • Firearms or fireworks are prohibited.
  • Glass containers are not allowed.
  • Public consumption of alcohol above 3.2% is prohibited (no kegs allowed).
  • Dogs must be on leashes not longer than 10 feet at all times. Dogs are not allowed at the swim beach.




Park Entrance Permits


Water Levels

Tips and Info

Background Image: Changing Aspen Leaves in Rocky Mountain National Park by Jeremy Hollis. All rights reserved.