Malheur Reservoir Depth Map & Fishing Spots (OR)

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 ~9 months

Recommendations come from depth structure and seasonal species behavior. Treat them as a starting point, not a guarantee. Contours here are interpolated from real agency depth surveys (state DNR / USACE). Never use for navigation. Always check local regulations.

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Recent catches at Malheur 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 Malheur Reservoir on the board.

Fishing Malheur Reservoir: what the data says

1,027-acre reservoir near Ironside. The lake tops out around 105 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. What the data behind the map says about each species, season by season:

Malheur Reservoir's chart carries 7.6 miles of bank. With a shoreline index of 2.2, this water is all arms and coves — edge habitat well beyond its acreage. Roughly 6% of the water is 15 ft or less, the band where the food chain lives. Tip to tip the water measures near 2.6 mi with a 0.7-mi widest point. Malheur County claims this one. Its nearest charted neighbour, Bully Creek Reservoir, is 27 mi to the southeast.

Rainbow Trout fishing at Malheur Reservoir

Come spring, look for rainbow trout tight to the bank in 5 to 20 ft. They move out to 8 to 30 ft in summer and finish the year down in 8 to 40 ft. If you only fish one area, make it First Creek inflow: an inflow / creek mouth around 14 ft that scores prime in spring. Best bite is early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon is the honest summer answer here.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	First Creek inflow (14 ft)	Inline spinner (silver), Small spoon
Summer	8 to 30 ft	dawn & dusk	First Creek inflow (14 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	10 to 35 ft	dawn & dusk	Main-lake point (28 ft)	Casting spoon, Jerkbait over shoals
Winter	8 to 40 ft	dawn	Old creek channel (18 ft)	Jigging spoon, Tube jig (white)

Smallmouth Bass fishing at Malheur Reservoir

Spring smallmouth bass on Malheur Reservoir hold shallow, usually 3 to 12 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 20 to 45 ft. The chart's best answer is Secondary point — point, 21 ft, prime for fall. Prime time lands in early morning and the evening. The summer box starts with a drop shot (goby/minnow) or a ned rig.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	dawn & dusk	First Creek inflow (14 ft)	Ned rig, Tube jig
Summer	10 to 30 ft	dawn & dusk	Main-lake point (28 ft)	Drop shot (goby/minnow), Ned rig
Fall	8 to 25 ft	midday & dawn	Secondary point (21 ft)	Jerkbait, Blade bait
Winter	20 to 45 ft	midday	Old creek channel (18 ft)	Blade bait, Hair jig

Notable structure

10 pieces of structure are mapped here — Deep basin, around 96 ft, is the deepest of them.

Deep basin: deep basin, around 96 ft
Break off the point: drop-off, around 69 ft
Main-lake point: point, around 28 ft
Shallow feeding flat: feeding flat, around 26 ft
Shallow feeding flat: feeding flat, around 26 ft
Secondary point: point, around 21 ft
Old creek channel: creek channel, around 18 ft
First Creek inflow: inflow / creek mouth, around 14 ft
Back-bay flat: feeding flat, around 13 ft
Shallow bay flat: feeding flat, around 9 ft

Public access & boat ramps

Malheur Reservoir — ramp

Access data: Oregon State Marine Board — Boating Access. Confirm conditions and fees locally before you launch.

Malheur Reservoir fishing regulations

Season dates, license requirements, and size and bag limits for Oregon waters are set by the Oregon Department of Fish and Wildlife — and special regulations can apply to Malheur Reservoir specifically, so confirm the current rules before you fish.

Check the official Oregon fishing regulations →

Common questions

How deep is Malheur Reservoir?

Malheur Reservoir is about 105 ft (32 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.

What fish are in Malheur Reservoir?

Anglers target rainbow trout, smallmouth bass on Malheur Reservoir.

Where is the best fishing spot on Malheur Reservoir?

First Creek inflow is the top-rated area: an inflow / creek mouth in about 14 ft of water that rates prime for rainbow trout in spring. The map above holds the full rated-spot list for every species and season.

When is the best time to fish Malheur Reservoir?

For rainbow 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.

What are the fishing regulations for Malheur Reservoir?

Fishing on Malheur Reservoir is regulated by the Oregon Department of Fish and Wildlife. Check the official Oregon regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.

Nearby waters

Bully Creek Reservoir 27 mi · Brownlee Reservoir 34 mi, ID/OR · Beulah Reservoir 38 mi · Mann Creek Reservoir 39 mi, ID · Van Patten Lake 47 mi · Anthony Lakes 49 mi · Strawberry Lake 49 mi · Olive Lake 53 mi · Hornet Reservoir 56 mi, ID · Ice Lake 63 mi · Lost Valley Reservoir 73 mi, ID · Sage Hen Reservoir 75 mi, ID

See how Malheur Reservoir stacks up: best smallmouth bass lakes in Oregon · best rainbow trout lakes in Oregon

Browse all Oregon fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.