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193-acre lake near Washtenaw County. The lake tops out around 18 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Below is the species-by-species picture, pulled from the same data the map uses.
On the chart, Fourmile Lake draws 251 acres inside 2.6 miles of shoreline. Its 1.2 shoreline index means few bank features; the contours below do the pattern work. 95% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. Tip to tip the water measures near 1 mi with a 0.5-mi widest point. You'll find it in Washtenaw County. The nearest mapped water is West Lake, 3 mi to the northwest.
Spring yellow perch on Fourmile Lake hold shallow, usually 3 to 12 ft. They move out to 5 to 18 ft in summer and finish the year down in 5 to 18 ft. Put Deep basin first on the milk run — a deep basin near 18 ft that grades prime for fall. The feeding windows run early morning. The summer box starts with a drop-shot micro plastics or a small spoon tipped with worm.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (1 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 5 to 18 ft chart-limited; documented 10 to 30 ft | dawn | Deep basin (18 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 5 to 18 ft chart-limited; documented 12 to 35 ft | midday | Deep basin (18 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 5 to 18 ft chart-limited; documented 15 to 35 ft | midday & dawn | Deep basin (18 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. Warm water sends them out to 5 to 18 ft; cold water stacks them in 5 to 15 ft. Break off the point is the standout, a drop-off at roughly 16 ft, rated prime for fall northern pike. Plan around early morning and the evening in the warm months. A bucktail or a weedless spoon over cabbage covers the summer program.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (1 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 5 to 18 ft chart-limited; documented 8 to 20 ft | dawn & dusk | Break off the point (16 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (16 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (1 ft) | Tip-ups, Large jigging spoon |
Spring puts smallmouth bass in skinny water — 3 to 12 ft is the zone. Warm water sends them out to 5 to 18 ft; cold water stacks them in 5 to 18 ft. Break off the point is the standout, a drop-off at roughly 16 ft, rated prime for winter smallmouth bass. Plan around early morning and the evening in the warm months. A drop shot (goby/minnow) or a ned rig covers the summer program.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Main-lake point (1 ft) | Ned rig, Tube jig |
| Summer | 5 to 18 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Break off the point (16 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 5 to 18 ft chart-limited; documented 8 to 25 ft | midday & dawn | Break off the point (16 ft) | Jerkbait, Blade bait |
| Winter | 5 to 18 ft chart-limited; documented 20 to 45 ft | midday | Break off the point (16 ft) | Blade bait, Hair jig |
In spring, largemouth bass run shallow here, mostly 2 to 10 ft. Midsummer fish sit out in 5 to 18 ft before dropping to 5 to 18 ft for winter. Winter largemouth bass concentrate at Break off the point, a prime-rated drop-off around 16 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a texas-rigged 10" worm or a deep-diving crankbait most summer days.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (1 ft) | Spinnerbait, Chatterbait |
| Summer | 5 to 18 ft chart-limited; documented 8 to 20 ft | dawn & dusk | Break off the point (16 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (1 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 5 to 18 ft chart-limited; documented 15 to 35 ft | midday | Break off the point (16 ft) | Blade bait, Jigging spoon |
Spring puts crappie in skinny water — 2 to 8 ft is the zone. Warm water sends them out to 5 to 18 ft; cold water stacks them in 5 to 18 ft. Deep basin is the standout, a deep basin at roughly 18 ft, rated prime for winter crappie. Plan around early morning and the evening in the warm months. A jig trolled/spider-rigged or a small crankbait (trolled) covers the summer program.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (1 ft) | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 5 to 18 ft chart-limited; documented 10 to 25 ft | dawn & dusk | Break off the point (16 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 5 to 18 ft chart-limited; documented 8 to 20 ft | dawn | Break off the point (16 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 5 to 18 ft chart-limited; documented 15 to 35 ft | midday | Deep basin (18 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
The spring pattern is a shallow one: bluegill in 1 to 6 ft. Midsummer fish sit out in 4 to 15 ft before dropping to 5 to 18 ft for winter. The spot to know is Shallow bay flat, a weed flat in about 1 ft of water that rates prime for bluegill in spring. Plan around early morning and the evening in the warm months. Summer baits: a small sponge spider (fly) or a micro tube jig gets it done.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Shallow bay flat (1 ft) | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 4 to 15 ft | dawn & dusk | Shallow bay flat (1 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Break off the point (16 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 5 to 18 ft chart-limited; documented 10 to 25 ft | midday | Deep basin (18 ft) | Tungsten ice jig + plastic, Tiny spoon |
The chart marks 6 structure features on Fourmile Lake; the deepest is Deep basin at about 18 ft.
Access data: Michigan DNR — Michigan Boating Access Sites. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Michigan waters are set by the Michigan DNR — and special regulations can apply to Fourmile Lake specifically, so confirm the current rules before you fish.
Check the official Michigan fishing regulations →
Fourmile Lake is about 18 ft (5 m) deep at its deepest point. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target yellow perch, northern pike, smallmouth bass, largemouth bass, crappie, bluegill on Fourmile Lake. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Deep basin is the top-rated area: a deep basin in about 18 ft of water that rates prime for yellow perch in fall. The map above holds the full rated-spot list for every species and season.
For yellow perch, the summer bite is best in early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Fourmile Lake is regulated by the Michigan DNR. Check the official Michigan regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
West Lake 3 mi · Gorman Lake 4 mi · North Lake 4 mi · Island Lake 5 mi · Long Lake 5 mi · Green Lake 6 mi · Little Portage Lake 6 mi · Silver Lake 6 mi · Halfmoon Lake 6 mi · Parks Lake 6 mi · Hi-Land Lake 6 mi · South Lake 7 mi
See how Fourmile Lake stacks up: best largemouth bass lakes in Michigan · best smallmouth bass lakes in Michigan · best northern pike lakes in Michigan · best crappie lakes in Michigan
More water nearby: Washtenaw County fishing maps (30 charts). Browse all Michigan fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. 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.