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432-acre reservoir in Cache County, Utah. The lake tops out around 82 ft. The contours come from a model of the real basin shape and its known max depth. Read them as probabilities, not soundings, and keep them out of navigation decisions. Below is the species-by-species picture, pulled from the same data the map uses.
Drawn out, this is 443 acres of water rimmed by 4.8 miles of bank. Index 1.6 on the shoreline: a few honest points and pockets, nothing labyrinthine. The shallow band under 15 ft claims about 11% of the surface on the model — that's where the groceries are. Tip to tip the water measures near 1.8 mi with a 0.8-mi widest point. You'll find it in Cache County. For a second option, Mantua Reservoir lies 9 mi southwest.
Early season brown trout use the shallows, holding in 3 to 25 ft. Expect a summer slide to 25 to 60 ft, then a winter hold in 5 to 35 ft. Put Creek inflow first on the milk run — an inflow / creek mouth near 8 ft that grades prime for spring. In summer the feeding windows fall in after dark and early morning. Tie on a spoon at the thermocline or a deep stickbait (night) and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 25 ft | dawn & dusk | Creek inflow (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 25 to 60 ft | night & dawn | Break off the point (37 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 5 to 30 ft | dusk & dawn | Creek inflow (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 5 to 35 ft | dawn | Creek inflow (8 ft) | Jigging spoon, Small stickbait (slow) |
The spring pattern is a shallow one: rainbow trout in 5 to 20 ft. As the season builds they drop to 8 to 30 ft, wintering in 8 to 40 ft. Top water on the chart: Creek inflow, an inflow / creek mouth in the 8 ft range, prime in spring. Time it for early morning and the evening. Summer baits: a dodger + spoon (deep troll) or a flutter spoon gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Creek inflow (8 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Creek inflow (8 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (21 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (37 ft) | Jigging spoon, Tube jig (white) |
Spring yellow perch on Hyrum Reservoir hold shallow, usually 3 to 12 ft. They move out to 10 to 30 ft in summer and finish the year down in 15 to 35 ft. Put Shallow bay flat first on the milk run — a feeding flat near 6 ft that grades prime for spring. The feeding windows run early morning. The summer box starts with a drop-shot micro plastics or a small spoon tipped with worm.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (6 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 10 to 30 ft | dawn | Break off the point (37 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 12 to 35 ft | midday | Break off the point (37 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 15 to 35 ft | midday & dawn | Break off the point (37 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Count 11 structure marks on this chart. The deepest, Deep basin, sits near 70 ft.
Access data: Utah DNR — Boat Ramps. Confirm conditions and fees locally before you launch.
| Date | Species | Count | Size |
|---|---|---|---|
| May 12 | Brown Trout | 2,100 | ~3.4" |
| Apr 23 | Rainbow trout | 350 | ~15.3" |
| Mar 18 | Rainbow trout | 648 | ~8.1" |
| Feb 9 | Rainbow trout | 5,580 | ~9.9" |
| Oct 22, 2025 | Rainbow trout | 3,349 | ~11.1" |
| Oct 7, 2025 | Rainbow trout | 4,018 | ~10.7" |
| Oct 6, 2025 | Rainbow trout | 2,000 | ~10.7" |
| Oct 6, 2025 | Rainbow trout | 3,999 | ~10.7" |
Source: Utah DWR fish-stocking report, retrieved 2026-08-18.
Season dates, license requirements, and size and bag limits for Utah waters are set by the Utah Division of Wildlife Resources — and special regulations can apply to Hyrum Reservoir specifically, so confirm the current rules before you fish.
Check the official Utah fishing regulations →
Hyrum Reservoir is about 82 ft (25 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 brown trout, rainbow trout, yellow perch on Hyrum Reservoir.
Creek inflow is the top-rated area: an inflow / creek mouth in about 8 ft of water that rates prime for brown trout in spring. Open the map above to see every rated spot for each species and season.
For brown trout, the summer bite is best in after dark and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Yes — per Utah DWR fish-stocking report records, Hyrum Reservoir was most recently stocked May 12 with 2,100 brown trout. The full stocking history is listed above.
Fishing on Hyrum Reservoir is regulated by the Utah Division of Wildlife Resources. Check the official Utah regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Mantua Reservoir 9 mi · Porcupine Reservoir 9 mi · Willard Bay Reservoir 20 mi · Newton Reservoir 21 mi · Pineview Reservoir 24 mi · Causey Reservoir 26 mi · Birch Creek Reservoir 29 mi · Lamont Reservoir 34 mi, ID · Foster Reservoir 35 mi, ID · Bear Lake 37 mi, UT/ID · Lost Creek Reservoir 38 mi · Treasureton Reservoir 43 mi, ID
See how Hyrum Reservoir stacks up: best rainbow trout lakes in Utah · best yellow perch lakes in Utah · best brown trout lakes in Utah
Browse all Utah 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.