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458-acre reservoir near Larimer County. The lake tops out around 24 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What follows comes from the same scoring engine that paints the spots above.
Lon Hagler Reservoir's chart carries 2.2 miles of bank. Its 1.1 shoreline index means few bank features; the contours below do the pattern work. The shallow band under 15 ft claims about 89% of the surface on the model — that's where the groceries are. The basin spans about 0.8 mi end to end and 0.5 mi across at its widest. It sits in Larimer County. Its nearest charted neighbour, Carter Lake, is 4 mi to the southwest.
Spring largemouth bass on Lon Hagler Reservoir hold shallow, usually 2 to 10 ft. They move out to 8 to 20 ft in summer and finish the year down in 7 to 24 ft. Put Shallow bay flat first on the milk run — a weed flat near 3 ft that grades prime for spring. The feeding windows run early morning and the evening. The summer box starts with a texas-rigged 10" worm or a deep-diving crankbait.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (3 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (11 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (8 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 7 to 24 ft | midday | Break off the point (11 ft) | Blade bait, Jigging spoon |
Early season smallmouth bass use the shallows, holding in 3 to 12 ft. Summer is a 7 to 24 ft game here, winter a 7 to 24 ft one. The chart's best answer is Main-lake point — point, 8 ft, prime for fall. Best bite is early morning and the evening. Tie on a drop shot (goby/minnow) or a ned rig and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Main-lake point (8 ft) | Ned rig, Tube jig |
| Summer | 7 to 24 ft | dawn & dusk | Break off the point (11 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 7 to 24 ft | midday & dawn | Main-lake point (8 ft) | Jerkbait, Blade bait |
| Winter | 7 to 24 ft | midday | Break off the point (11 ft) | Blade bait, Hair jig |
When the water first warms, common carp slide up into 2 to 10 ft. By summer they slide out to 3 to 15 ft, and by winter most fish are in 7 to 24 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 3 ft that scores prime in spring. In summer the feeding windows fall in early morning and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Shallow bay flat (3 ft) | |
| Summer | 3 to 15 ft | dawn & dusk | Shallow bay flat (3 ft) | |
| Fall | 5 to 18 ft | midday | Shallow bay flat (3 ft) | |
| Winter | 7 to 24 ft | midday | Deep basin (20 ft) |
Spring channel catfish on Lon Hagler Reservoir hold shallow, usually 3 to 12 ft. They move out to 7 to 24 ft in summer and finish the year down in 7 to 24 ft. Put Deep basin first on the milk run — a deep basin near 20 ft that grades prime for winter. The feeding windows run after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Shallow bay flat (3 ft) | |
| Summer | 7 to 24 ft | night & dusk | Deep basin (20 ft) | |
| Fall | 7 to 24 ft | dusk | Deep basin (20 ft) | |
| Winter | 7 to 24 ft | midday | Deep basin (20 ft) |
Early season crappie use the shallows, holding in 2 to 8 ft. Summer is a 7 to 24 ft game here, winter a 7 to 24 ft one. The chart's best answer is Deep basin — deep basin, 20 ft, prime for winter. Best bite is early morning and the evening. Tie on a jig trolled/spider-rigged or a small crankbait (trolled) and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (3 ft) | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 7 to 24 ft | dawn & dusk | Break off the point (11 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Break off the point (11 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 7 to 24 ft | midday | Deep basin (20 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
The spring pattern is a shallow one: walleye in 4 to 15 ft. Midsummer fish sit out in 7 to 24 ft before dropping to 7 to 24 ft for winter. The spot to know is Break off the point, a drop-off in about 11 ft of water that rates prime for walleye in fall. Plan around the evening and early morning in the warm months. Summer baits: a crawler harness on bottom bouncer or a deep crankbait (trolled) gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Main-lake point (8 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 7 to 24 ft | dusk & dawn | Break off the point (11 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 7 to 24 ft | dusk & night | Break off the point (11 ft) | Jigging rap, Jig + big minnow |
| Winter | 7 to 24 ft | dusk & dawn | Deep basin (20 ft) | Jigging spoon + minnow head, Rattle bait |
Lon Hagler Reservoir also holds yellow perch (7 to 24 ft in summer), muskellunge (7 to 24 ft in summer), bluegill (4 to 15 ft in summer), rainbow trout (6 to 24 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Lon Hagler Reservoir carries 7 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 20 ft down.
Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Colorado waters are set by the Colorado Parks & Wildlife — and special regulations can apply to Lon Hagler Reservoir specifically, so confirm the current rules before you fish.
Check the official Colorado fishing regulations →
Lon Hagler Reservoir is about 24 ft (7 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target largemouth bass, smallmouth bass, common carp, channel catfish, crappie, walleye, yellow perch, muskellunge, bluegill, rainbow trout on Lon Hagler Reservoir.
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for largemouth bass in spring. Scroll up to the map for the complete spot list by species and season.
For largemouth bass, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Lon Hagler Reservoir is regulated by the Colorado Parks & Wildlife. Check the official Colorado regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Carter Lake 4 mi · Boyd Lake 8 mi · Horsetooth Reservoir 13 mi · Union Reservoir 14 mi · Windsor Reservoir 16 mi · Button Rock Res 16 mi · Estes Lake 18 mi · Milavec Reservoir 20 mi · Marys Lake 20 mi · Boulder City Reservoir 20 mi · Waneka Lake 26 mi · Gross Reservoir 31 mi
See how Lon Hagler Reservoir stacks up: best largemouth bass lakes in Colorado · best smallmouth bass lakes in Colorado · best walleye lakes in Colorado · best crappie lakes in Colorado
More water nearby: Larimer County fishing maps (6 charts). Browse all Colorado fishing maps or see every water on DepthScout. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.