Mann Creek Reservoir Depth Map & Fishing Spots (ID)

Skip to interactive depth chart

Lake depth chart

Mann Creek Reservoir, ID

Max 123 ft

Today's read

Where to start

Callibaetis (Speckled Dun) window is on — see the hatch outlook

Hatch outlook

Callibaetis (Speckled Dun)Active window

Typical here: Aug 15 – Sep 15 · the smaller fall brood

nymphthe hours before the midday emergence — nymphs rise off the weed tops in a vertical zigzag that can take hours — sources split between slow 2–4 inch strips with long pauses and a quicker steady retrieve; carry both speeds
dunmidday, roughly 11am into early afternoon
spinnermid-to-late-morning falls

Trout browse the weed-bed edges knocking nymphs loose, then cruise the flats sipping duns at midday — the marquee western lake mayfly.

The midday emergence puts cruisers over weed flats in under 20 ft: a casting bubble with a #14 Callibaetis nymph retrieved dead-slow with pauses is the honest match. Between hatch hours, small spoons and #1 inline spinners along the weed edges and drop-offs pick off the same fish.

The event happens over weed flats and weed-bed edges in 20 ft of water or less

Chironomids (stillwater midges)Active window

Typical here: May 1 – Oct 31

nymphearly morning, start of the day — fish the bloodworm ON the bottom — 4–6 inches off the mud before the emergence starts
pupathe cool morning hours are prime — as the emergence builds, slide the pupa up to 12–15 inches off bottom under the indicator; a little wind chop does the jigging

Concentrates by DEPTH BAND and mud type, not a fixed spot: roughly 20–25 ft in spring, deeper midsummer, in against the feeder creeks in summer heat, 5–25 ft in fall. Match the band.

This one translates almost perfectly: a slip float with a 1/64–1/100 oz midge-pattern jig set 4–15 inches off bottom over a mud flat, dead-sticked with the chop doing the work. Depth control is everything — no moving lure imitates a hanging pupa; the float rig IS the technique.

The event happens over open mud flats alongside weedlines, channels and basin edges; feeder-creek mouths in summer heat

Water boatman fall flightsActive window

Typical here: Aug 25 – Oct 10 · peaks on crisp, bright fall days after the first cold snap

adultmiddday-ish on calm, sunny fall days — the fishable moment is the splashdown: boatmen dive in headfirst trailing an air bubble and make repeated trips back to the surface — a fly or lure that dives nose-first on the drop imitates exactly this

Takes are seldom subtle — trout ravage boatmen as they hit the water and during their subsurface runs.

Tailor-made for hardware: a small 1/16 oz silver-bellied spoon or jig cast AT the rings of a splashdown sinks headfirst exactly like the natural — twitch-pause it back through the top few feet. On flight days fan-cast the shallow weed margins.

The event happens over near-shore shallows, weed beds and shoal margins on calm sunny fall afternoons

Grasshoppers (east-side summer)Active window

Typical here: Jun 15 – Sep 30

adultall day in high summer, best when afternoon wind knocks bugs onto the water

Pulls fish to the windward grassy banks and edges for months — fish the bank the wind blows ONTO.

The friendliest crossover of the summer: on lakes, drift the windward bank with a bubble-and-foam-hopper — the bubble's splash doesn't hurt a hopper presentation. On rivers, the same rig dead-drifted along the undercut grass banks, or small gold spinners under the banks between rises.

The event happens over grassy banks, undercut edges and windward shorelines

Next on this water

Damselfly migration · forageMay 15 – Jul 31 · in ~8 months

Recommendations come from depth structure and seasonal species behavior. Treat them as a starting point, not a guarantee. Contours on this water are approximations. Never use for navigation. Always check local regulations.

Loading depth chart…

Recent catches at Mann Creek Reservoir

Shared by DepthScout anglers. Exact spots stay private, always.

No shared catches here yet — be the first.Log a catch from the map above and share it to put Mann Creek Reservoir on the board.

Fishing Mann Creek Reservoir: what the data says

270-acre reservoir in Washington. The lake tops out around 123 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. Here is how the season plays out for each species, straight from the data behind the map.

Drawn out, this is 272 acres of water rimmed by 4.6 miles of bank. Index 2 on the shoreline: a few honest points and pockets, nothing labyrinthine. 33% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. Call it 1.8 mi long by 0.4 mi wide at the broadest reach. The water lies in Washington County. The nearest mapped water is Brownlee Reservoir, 15 mi to the northwest.

Cutthroat Trout fishing at Mann Creek Reservoir

Early season cutthroat trout use the shallows, holding in 3 to 15 ft. Summer is a 10 to 35 ft game here, winter a 10 to 40 ft one. The chart's best answer is Main-lake point — point, 31 ft, prime for summer. Best bite is early morning and the evening. Tie on a trolled spoon (small) or an inline spinner and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 15 ft	dawn & dusk	open water	Inline spinner (silver/gold), Small spoon
Summer	10 to 35 ft	dawn & dusk	Main-lake point (31 ft)	Trolled spoon (small), Inline spinner
Fall	5 to 25 ft	dawn & dusk	Main-lake point (31 ft)	Casting spoon, Inline spinner
Winter	10 to 40 ft	dawn	Main-lake point (31 ft)	Small jigging spoon, Marabou jig

Rainbow Trout fishing at Mann Creek Reservoir

The spring pattern is a shallow one: rainbow trout in 5 to 20 ft. Midsummer fish sit out in 8 to 30 ft before dropping to 8 to 40 ft for winter. The spot to know is Main-lake point, a point in about 31 ft of water that rates prime for rainbow trout in fall. Plan around early morning and the evening in the warm months. 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	Shallow bay flat (6 ft)	Inline spinner (silver), Small spoon
Summer	8 to 30 ft	dawn & dusk	Main-lake point (31 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	10 to 35 ft	dawn & dusk	Main-lake point (31 ft)	Casting spoon, Jerkbait over shoals
Winter	8 to 40 ft	dawn	Break off the point (55 ft)	Jigging spoon, Tube jig (white)

Notable structure

6 pieces of structure are mapped here — Deep basin, around 105 ft, is the deepest of them.

Deep basin: deep basin, around 105 ft
Break off the point: drop-off, around 55 ft
Main-lake point: point, around 31 ft
Secondary point: point, around 31 ft
Shallow bay flat: weed flat, around 6 ft
Back-bay flat: weed flat, around 6 ft

Mann Creek Reservoir stocking report

Date	Species	Count	Size
Apr 30	Rainbow Trout	—	~13"
Apr 3	Rainbow Trout	—	~13"

Source: Idaho Fish & Game stocking records, retrieved 2026-09-03.

Mann Creek Reservoir fishing regulations

Season dates, license requirements, and size and bag limits for Idaho waters are set by the Idaho Fish and Game — and special regulations can apply to Mann Creek Reservoir specifically, so confirm the current rules before you fish.

Check the official Idaho fishing regulations →

Common questions

How deep is Mann Creek Reservoir?

Mann Creek Reservoir is about 123 ft (37 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.

What fish are in Mann Creek Reservoir?

Anglers target cutthroat trout, rainbow trout on Mann Creek Reservoir.

Where is the best fishing spot on Mann Creek Reservoir?

Main-lake point is the top-rated area: a point in about 31 ft of water that rates prime for cutthroat trout in summer. Every other rated spot, per species and season, is on the map above.

When is the best time to fish Mann Creek Reservoir?

For cutthroat trout, 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.

Is Mann Creek Reservoir stocked with fish?

Yes — per Idaho Fish & Game stocking records records, Mann Creek Reservoir was most recently stocked Apr 30 with rainbow trout. The full stocking history is listed above.

What are the fishing regulations for Mann Creek Reservoir?

Fishing on Mann Creek Reservoir is regulated by the Idaho Fish and Game. Check the official Idaho regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.

Nearby waters

Brownlee Reservoir 15 mi, ID/OR · Hornet Reservoir 29 mi · Sage Hen Reservoir 36 mi · Bully Creek Reservoir 36 mi, OR · Malheur Reservoir 39 mi, OR · Cascade Reservoir 42 mi · Lost Valley Reservoir 45 mi · Payette Lake 56 mi · Lake Lowell 59 mi · Goose Lake 59 mi · Blackwell Lake 59 mi · Ice Lake 60 mi, OR

See how Mann Creek Reservoir stacks up: best rainbow trout lakes in Idaho · best cutthroat trout lakes in Idaho

Browse all Idaho 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.