John Martin Reservoir is a large state park reservoir on the Arkansas River in Bent County, Colorado, located near the town of Las Animas on the eastern plains. With over 112 reviews and a 4.4-star rating, this sprawling body of water draws anglers, campers, boaters, and kayakers to one of the best fishing destinations on the Colorado prairie. The reservoir holds walleye, crappie, catfish, white bass, and wiper, with shoreline action available using crankbaits, swimbaits, spinners, shiners, leeches, worms, and minnows. Hard cover along the banks includes submerged trees and rock structure across multiple points and coves.
Fishing at John Martin Reservoir is the main draw, with six or more distinct points and coves offering varied structure and cover. Walleye season brings dedicated anglers camping for multi-day trips. Wiper fishing is productive, with catches of five or more fish reported in single sessions. Boat fishing tends to outperform shore fishing when water levels are low, as bank access can require long walks or descents down steep rock cliffs at the Point Campground. The boat ramp accommodates launches efficiently, with reviewers noting fast-moving lines that keep wait times short.
Two campgrounds serve visitors with different needs. Lake Hasty Campground offers shade trees, electric hookups, water taps, shelters, an RV dump station, and easier access to the spillway and fishing spots. The Point Campground sits on the reservoir side and provides a more remote experience with no trees, no shade, no water, and limited vault toilets. Dispersed camping is available in the dunes area above the reservoir for those who prefer boondocking without paying for a site. Dry camping runs around thirty dollars per night, while electric sites cost more.
Kayaking on John Martin Reservoir is popular, with open water and minimal boat traffic on quieter days. Swimming is available at the designated swim beach near Lake Hasty, though algae blooms have been reported in summer months, sometimes producing green discoloration and unpleasant odors. Check current water quality advisories before swimming, as toxic blue-green algae has prompted warnings in past years. Birding is exceptional here, with bald eagles, shorebirds, and diverse species attracting dedicated birders for day trips. The reservoir is also recognized as a dark sky location, making it a strong choice for stargazing and telescope nights.
Wind is a constant factor at John Martin, frequently blowing twenty miles per hour or more, so stake down tents and canopies securely. Mosquitoes and biting insects are aggressive from late spring through summer, and reviewers strongly recommend applying bug spray before entering the park and bringing bug zappers. Cell and internet service is available at the campgrounds. The drive in should follow the route through Las Animas past Bents Old Fort rather than GPS directions to the south. Nearby historical sites include the Amache Japanese Internment Camp and the Sand Creek Massacre National Historic Site, both a short drive from the campground. Mountain biking, disc golf, and four-wheel-drive trails on dirt roads around the reservoir provide additional activities beyond the water.