Fishing on OSMP

Please follow these rules and suggestions to protect our resources and keep the fishing experience great for everyone.

Visit Colorado Parks & Wildlife's website '101 places to take kids fishing' for local options.

• Always check the trailhead regulation board before you fish for any rule changes or seasonal updates.
• If you are 16 or over, you must have a valid fishing license issued by Colorado Parks & Wildlife. You can purchase a license online or buy a fishing license at some fishing shops or sporting goods stores.
• A standard fishing license only allows you to fish with one line at a time. To fish with a second line, you must purchase an additional second rod stamp with your license for $5. Fishing with more than two lines is illegal (this includes having any additional fishing lines in the water, even if the fishing line is not attached to a fishing rod).
• Swimming is not allowed in any of OSMP’s bodies of water. Wading into ponds and lakes is prohibited at KOA Lake, Wonderland Lake, and Boulder Valley Ranch Reservoir. You may wade into creeks unless a closure is in place.
• All of the fishing along Boulder Creek (but not South Boulder Creek) is “catch and release.”
• Size and bag limits apply for some fish: minimum size for both smallmouth and largemouth bass is 15 inches, daily possession limit is five; you are only allowed one Tiger Muskie (formerly stocked in Teller Lake No.5) and it must be 36 inches or longer.
• Please note that you may not set up shelters or structures when ice fishing. Colorado’s winter temperatures fluctuate quickly – it is your responsibility to make sure the ice is thick enough to support your weight.
• Please familiarize yourself with other OSMP rules and regulations regarding dogs, fire arms, area closures etc. Regulations may change seasonally or from place to place, so always check trailhead postings for local rules.

To preserve our fishing resources and ensure fishing enjoyment for other visitors, OSMP encourages the catch and release ethic. Please do your part and consider releasing all fish caught. To help released fish survive, return them to the water immediately. Live bait is prohibited in most of the Sawhill Ponds and Boulder Creek to help released fish survive. Artificial lures cause less damage to a fish’s mouth and are less likely to be swallowed. Please check local regulations before fishing. Learn the gentle art of releasing a fish so that it will survive the trauma of capture. This way, the fish may survive to breed, and will help keep our fishing resources plentiful.

Please do not litter on OSMP. Trash often kills wildlife when they try to eat it, or become tangled in it. Fishing line is especially deadly to wild animals – please take all your discarded line with you! Litter spoils the scenery at our ponds and creeks. Leaving litter is illegal and could result in a summons and a stiff fine. Please pick up any plastic trash you find - even if it isn't yours. You might save an animal's life

Anglers can unintentionally spread a number of very damaging environmental pests, such as Eurasian water milfoil (a noxious water plant) or New Zealand mud snails, tiny snails that spread rapidly and take over creeks.

Due to infestations of New Zealand mudsnails, portions of Boulder Creek and Dry Creek are closed year-round. Also, due to the recent discovery of mudsnails there, South Boulder Creek is temporarily closed between South Boulder Road and Marshall Road. OSMP is currently evaluating long-term, systemwide management strategies for this invasive species. Please do your part and respect these posted closures. Please view information on the New Zealand mudsnails and closure maps on the New Zealand Mudsnails page.

Special Note about Bull Frogs

Bull frogs are another noxious pest species in OSMP’s ponds and lakes. You can enjoy the great taste of frog legs AND do the environment a big favor by harvesting them.

Bull frog collection requires a valid fishing license for anglers 16 years of age or older. There is no limit to the number of bull frogs you can take. That said …

Know your frogs – Bull frogs are large and uniformly green or gray without markings. The rare Northern Leopard Frog is smaller and is covered with black spots. Although it is unlikely that you would mistake the two, please take extra care since leopard frogs are vanishing from Colorado’s waterways. The Woodhouse Toad is also common around many ponds; it is inedible and protected.

Bull frogs are easy to capture at night with a flashlight and a dip net or a gig (a fork-like harpoon on a long rod). During the day, try casting a fish hook with a red piece of cloth near the frog, who may try to swallow it as you reel it in.