John Martin Reservoir, CO

About John Martin Reservoir

John Martin Reservoir is a sprawling plains impoundment on the Arkansas River in southeastern Colorado, sitting between the towns of Las Animas and Lamar in Bent County. Often called the "Sapphire on the Plains," it is one of the largest bodies of water in this dry corner of the state, and its open, wind-swept basin, gradual mud-and-gravel flats, and submerged river channel give it a character very different from Colorado's high-country trout lakes. The reservoir is a flood-control and irrigation project, so its level can swing dramatically from year to year and season to season, which is the single biggest factor shaping how and where you fish it.

Anglers know John Martin first and foremost as a warm-water reservoir famous for its walleye and saugeye fishing, backed by a strong mixed bag of wiper (hybrid striped bass), white bass, crappie, and catfish. When water conditions are good it can produce excellent numbers of eating-size fish plus the occasional true trophy walleye. The combination of plentiful forage, a long growing season, and relatively light pressure compared with Front Range lakes makes it a destination trip for many Colorado and out-of-state anglers chasing a cooler full of fillets.

Fish Species

John Martin holds a deep and varied warm-water fishery. The standouts that draw most anglers are:

• Walleye — the marquee species, found over flats, points, and along the old river channel; prized for both numbers and the chance at a heavy fish.
• Saugeye — the walleye-sauger hybrid thrives in this turbid, fluctuating plains environment and is often more aggressive and tolerant of dingy water than pure walleye.
• Wiper (hybrid striped bass) — hard-fighting open-water predators that school up and chase shad, capable of screaming drag runs.
• White bass — abundant schooling fish that provide fast, light-tackle action, especially when they push baitfish to the surface.
• Crappie — found around flooded brush, rip-rap, and any available structure; numbers and size vary with water level.
• Channel catfish — plentiful and a reliable bet, with flathead catfish present as well for those targeting bigger fish.

You may also encounter largemouth and smallmouth bass, bluegill and other sunfish, drum, and rough fish such as carp. The fishery's makeup shifts with the reservoir's level — high, stable water tends to flood vegetation and brush and boost spawning success across most species.

Best Seasons & Times

Spring is prime time. As water warms into the 40s and 50s, walleye and saugeye move shallow toward the upper end, the dam face, and rocky shorelines to spawn, and they are catchable from boat and bank. White bass and wiper follow with their own spring movements up toward the inflow. This is the best window for numbers and for big pre-spawn walleye.

Summer spreads fish out. Walleye and saugeye slide to deeper structure, the river channel, and main-lake points, biting best at low light. Wiper and white bass go on the chase, busting shad on the surface on calm mornings and evenings — watch for diving birds and surface boils. Catfish are at their most active in warm water, day or night.

Fall brings a strong feed-up as cooling water concentrates baitfish. Walleye, saugeye, and wiper put on the feedbag, and this is a great time for both quality and quantity before winter.

Winter slows things down; on the plains the reservoir may or may not lock up with safe ice depending on the year, so always verify conditions locally before venturing out. When fishable, walleye, saugeye, and crappie can still be caught deep and slow.

Across all seasons, the best bite is typically the first and last hours of daylight, and overcast or breezy days that put a "walleye chop" on the water often outproduce flat, bright conditions.

Techniques & Baits

Walleye and saugeye:

• Jigs tipped with a nightcrawler, minnow, or soft-plastic ringworm/grub worked along flats, points, and the channel edge.
• Bottom-bouncers and spinner/crawler harnesses trolled to cover water and find scattered fish.
• Crankbaits trolled or cast on shallow rocky areas in spring and fall; lipless cranks shine in dingy water.
• Slip-bobber rigs with a leech or minnow over structure for a slow, precise presentation.

Wiper and white bass:

• Cast spoons, blade baits, swimbaits, and lipless crankbaits into surface-feeding schools, then count down to reach fish holding deeper.
• Trolling crankbaits or vertically jigging spoons over open-water schools when fish are down.

Crappie: small jigs and tube baits or a live minnow under a bobber around flooded brush, rip-rap, and any submerged cover.

Catfish: cut bait, shad, nightcrawlers, shrimp, or prepared stinkbaits fished on the bottom; flatheads favor live bait. Because the water is often stained, scent- and vibration-heavy presentations consistently produce. Use the wind to your advantage — drifting flats or working windblown shorelines often puts you on active fish.

Access & Launches

John Martin Reservoir is paired with a Colorado state park on its grounds, and access is centered around that park and the surrounding state and federal lands. There are developed boat-launch facilities, day-use areas, and shoreline access points, along with camping near the water, making it well suited to both boat and bank anglers. The dam, the area below it on the river, and the broad shorelines all offer fishing opportunities.

Because this is a flood-control reservoir, water levels fluctuate significantly — ramps and shoreline access that work at high water may be unusable when the lake is low, and vice versa. Before a trip, check current lake-level and facility conditions, and be prepared for the strong winds and limited shade typical of the open plains. A standard park pass or entry fee generally applies for state-park access; confirm current details with the park before you go.

Regulations & Licenses

A valid Colorado fishing license is required for all anglers of licensing age, available online and from local vendors. John Martin is managed for its warm-water species, and slot limits, minimum sizes, and daily bag limits apply and can differ by species — walleye and saugeye in particular often carry specific size and possession rules.

Regulations also change from year to year and may include water-body-specific rules, so always review the current Colorado Parks and Wildlife fishing brochure and any posted signage before keeping fish. Follow all rules on bait, gear, and any seasonal or area closures, and practice good stewardship by releasing fish you don't intend to eat.

Frequently Asked Questions

What is John Martin Reservoir best known for catching?
It is best known as a warm-water walleye and saugeye fishery, with strong supporting populations of wiper (hybrid striped bass), white bass, crappie, and channel catfish. Spring walleye and summer wiper action are the headline draws.

When is the best time to fish John Martin Reservoir?
Spring is the standout season as walleye and saugeye move shallow to spawn and white bass and wiper run, while fall offers an excellent feed-up. Within any day, the first and last hours of light — especially on breezy, overcast days — typically produce the best bite.

Do I need a license, and are there size or bag limits?
Yes, every angler of licensing age needs a valid Colorado fishing license. Size, slot, and daily bag limits apply and vary by species, and they can change year to year, so check the current Colorado Parks and Wildlife regulations before keeping fish.

Can you fish from the bank, or do you need a boat?
Both work. The reservoir has developed launch facilities for boaters plus broad shorelines, the dam area, and the river below it for bank anglers. Just keep in mind that water levels fluctuate a lot, which can change where shoreline and ramp access is usable on any given trip.