Swimbait Fishing on John Martin Reservoir
John Martin Reservoir · Colorado · West
John Martin Reservoir sits on the Arkansas River near Hasty, Colorado, impounded by the U.S. Army Corps of Engineers primarily for flood control and irrigation — which means water levels fluctuate dramatically season to season. The reservoir trends turbid to stained throughout most of the year, with a flat, prairie-basin morphology broken by submerged creek channels, riprap shorelines, and sparse woody cover. Largemouth bass, smallmouth bass, walleye, and wipers (hybrid striped bass) share the fishery, making it one of southeastern Colorado's most diverse angling options.
Covers everything from 3" paddle tails to 10"+ hard-body glide baits. Paddle tails on a swimbait head cover water efficiently; large glide baits and jointed hard swimbaits target trophy fish specifically. Swimbait fishing rewards patience — fewer bites, but the bites that come are often the biggest bass of your life.
Swimbait Setup for John Martin Reservoir
| Rod | 7'3"–8' medium-heavy to heavy casting rod, moderate action (for big baits) |
| Reel | 5.4:1–6.4:1 baitcaster (slower for big baits, need power) |
| Line | 15–20 lb fluorocarbon; 65 lb braid for glide baits |
| Weight | Paddle tail on 1/4–1 oz head; glide baits 2–6 oz depending on size |
Seasonal Tactics on John Martin Reservoir
Lake: Pre-spawn largemouth push into the shallower riprap and any available brushy cover as water temps climb through the low 60s, typically late April into May. Lipless crankbaits like the Strike King Red Eye Shad in 1/2 oz worked along rocky points produce aggressive strikes before bass move to whatever limited spawning flats are available at the current pool level.
Swimbait: Post-spawn giants recovering — slow roll a big paddle tail along the first drop off beds.
Lake: Summer concentrates bass and walleye on the deeper submerged creek channel edges in 12–22 ft of water as surface temps push into the mid-70s. Anglers fishing bottom-contact presentations — a 1/2 oz football jig on 15 lb fluorocarbon or a drop shot with a 4-inch Roboworm — find fish that have vacated the wind-blasted shallow flats.
Swimbait: Early morning on main lake points. Slow-roll a 6"+ swimbait along ledge faces at dawn.
Lake: Fall triggers some of the most reliable feeding windows of the year as shad and other forage stack in creek channel bends and the main basin narrows toward the dam. Swimbaits and medium-diving crankbaits like the Strike King Series 5 in shad patterns cover water efficiently during October's transition period.
Swimbait: Best season — bass targeting large shad. Match the size of forage exactly. Shad colors.
Lake: Winter drawdowns for irrigation delivery can pull water levels substantially, concentrating fish in the remaining deeper basin. Slow-rolled jigging spoons and drop shot rigs on 10 lb fluorocarbon in 15–25 ft are the consistent winter producers; the fishery receives almost no pressure during this window.
Swimbait: Slow down the retrieve dramatically. Big fish are lethargic but will eat a slow-moving large profile.
Best Conditions
Clear water, trophy fisheries, post-spawn and fall, shad migrations, open water and around structure, dawn and dusk
Slow down more than you think. Most anglers retrieve swimbaits too fast. A barely-moving bait triggers more bites from big, selective fish.
More Techniques for John Martin Reservoir
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