What River Bluffs Open Space offers anglers

River Bluffs Open Space is a 1,400-acre preserve along the South Platte River near Littleton, Colorado, about 20 miles south of Denver. The property includes roughly 4 miles of river access, a mix of riparian woodland and grassland, and several trails that run parallel to the water. The South Platte here is a tailwater fishery — cold, clear water released from Chatfield Reservoir — which holds brown trout and some rainbow trout year-round.

The open space is managed by the South Platte River Greenway Partnership and Colorado Parks and Wildlife. Day-use access is free, and the site draws both wading anglers and those who prefer to fish from the bank. The river corridor here is narrower and more intimate than many Colorado tailwaters, with overhanging willows and cottonwoods that require careful casting but reward patience with good fish.

Key Takeaways

  • River Bluffs Open Space provides free day-use access to 4 miles of the South Platte River, a cold-water tailwater below Chatfield Reservoir.
  • Brown trout dominate the fishery; rainbows are present but less common, and fish average 10 to 14 inches with occasional larger individuals.
  • Parking is available at two trailheads on Chatfield Avenue, and trails run the length of the property with multiple access points to the water.
  • A Colorado fishing license is required; the South Platte in this section is open year-round with a daily limit of two trout.
  • Best fishing typically occurs in fall and spring; summer can be productive early and late in the day when water temperatures are cooler.

Seasons and water conditions

The South Platte tailwater at River Bluffs is fishable year-round because Chatfield Reservoir keeps water temperature stable — usually between 45 and 55 degrees Fahrenheit depending on season. Fall (September through November) and spring (March through May) are the most reliable periods. Water levels are generally moderate during these months, and trout are actively feeding as they prepare for winter or respond to warming water.

Summer (June through August) can be productive, but fish often move to deeper, cooler runs during midday. Early morning and evening fishing — before 9 a.m. and after 5 p.m. — is most effective. Winter fishing is possible, but cold air temperatures and occasional ice make access difficult. Water levels can fluctuate based on Chatfield Reservoir operations; check the U.S. Geological Survey's real-time streamflow data for the South Platte near Littleton before you go, especially after heavy rain or during spring runoff.

Access, parking, and trail layout

River Bluffs Open Space has two main parking areas, both on Chatfield Avenue (County Road 85) south of Littleton. The northern trailhead is near the intersection with Mineral Avenue; the southern trailhead is roughly 2 miles further south. Both lots are small (10 to 15 spaces each) and fill quickly on weekends. Arrive early or plan for a weekday visit if you want reliable parking.

From either trailhead, trails descend to the river and run north-south along the bank. The terrain is relatively flat along the water, though the bluffs above rise 50 to 100 feet. Multiple informal paths lead down to the river, giving you options to spread out and find less-pressured water. The entire property is day-use only; no camping or overnight access is permitted. The site closes at dusk.

Fish species and what to expect

Brown trout are the primary species at River Bluffs. They range from 8 to 16 inches on average, with occasional fish pushing 18 to 20 inches. Rainbows are present but less abundant; they tend to be smaller and more aggressive on small flies. The river here is relatively narrow — 30 to 50 feet in most sections — and the current is moderate to brisk, creating defined runs and pools where trout hold.

The South Platte in this section has good insect hatches, particularly small mayflies (Baetis), caddisflies, and midges. Nymphing with small weighted patterns (size 16 to 20) is often more productive than dry-fly fishing, though dry-fly opportunities exist during hatches, especially in spring and fall. The river is clear, so fine tippet (5X to 7X) and careful approach are necessary. Fish can be selective, and the overhanging vegetation means you will need to cast accurately and be prepared to land fish quickly.

Regulations and licensing

A valid Colorado fishing license is required for anyone 16 and older. Licenses are available through Colorado Parks and Wildlife's website or at local sporting goods retailers in the Littleton area. The South Platte River at River Bluffs is open year-round with a daily limit of two trout (of any size). Bait fishing is permitted, but artificial flies and lures are more practical given the clear water and selective fish.

Check the current Colorado Parks and Wildlife fishing regulations before you go, as rules can change. The South Platte in this section is not subject to special restrictions like catch-and-release-only rules, but that can vary upstream and downstream, so know your exact location on the river.

Gear and tactics for this water

A 9-foot, 4-weight or 5-weight fly rod is standard for the South Platte here. The river is narrow enough that shorter casts are common, but you will benefit from accuracy over distance. Bring a mix of nymphs in sizes 14 to 20 — Pheasant Tails, Hare's Ears, and small Prince Nymphs work well. A few dry flies (size 16 to 18 Adams, Pale Morning Duns, or small caddis patterns) are worth having, especially in spring and fall.

Wading is straightforward in most sections, though the river bed is rocky and can be slippery. Felt-soled waders or wading boots with good grip are recommended. The current is strong enough that a wading staff can help, particularly if you are new to the river. Fish the deeper runs and behind large rocks; browns often hold in the slower water along the banks, especially near overhanging vegetation. Move slowly and cast upstream or across the current to avoid spooking fish.

Nearby services and alternatives

Littleton is 5 to 10 minutes north of River Bluffs and has gas stations, restaurants, and fly shops. The nearest fly shop is Cutthroat Anglers in Littleton, which carries local flies and can provide current conditions and advice specific to the South Platte. If River Bluffs is crowded or you want to explore other water, Chatfield Reservoir itself (just south of the open space) offers warm-water fishing for bass, pike, and catfish, though it is a different experience from the river.

The South Platte upstream from Chatfield (near Deckers and Sedalia) is also a popular tailwater fishery with similar species and conditions, though it requires a longer drive. Downstream from Littleton, the South Platte becomes warmer and slower, better suited to warm-water species. River Bluffs sits in a sweet spot for cold-water trout fishing close to the Denver metro area.

Frequently Asked Questions

Do I need a permit to fish River Bluffs Open Space?

No permit is required beyond a valid Colorado fishing license. The open space is free to enter during daylight hours. You must have your license with you while fishing.

Can I fish the South Platte here in winter?

Yes, the river is open year-round. Winter fishing is possible, but air temperatures can be cold and ice may form along the banks. Water temperature remains stable due to the tailwater, so trout are still active, though they feed less aggressively than in fall or spring.

What is the best time of day to fish River Bluffs?

Early morning (sunrise to 9 a.m.) and evening (5 p.m. to dusk) are most productive, especially in summer when midday water temperatures rise. Fall and spring offer good fishing throughout the day, though early and late hours are still reliable.

Are there restrictions on bait versus flies?

Both bait and artificial lures are permitted. However, the clear water and selective fish make flies more effective. If you use bait, small worms or minnows work, but expect to lose some to the current and rocks.

How crowded is River Bluffs on weekends?

The open space is popular, especially on Saturday and Sunday mornings. Parking fills quickly, and you may encounter other anglers along the river. Weekday visits or early arrival on weekends will give you more solitude and better access to productive water.