Oakland County · Michigan

Union Lake

Soundings in feet · 467 acres · deepest 110 ft

Where it is

3 miles west of Orchard Lake Village

Oakland County, Michigan · 42.6050° N, 83.4364° W

Directions to Union Lake Apple Maps

Directions open in Google or Apple Maps, to the Michigan DNR public access sites (2 listed; this is the first).

Today on the lake

Updated 14 Oct 2026, 6:16 pm EDT. Get alerts for Union Lake

WEATHERTonight: partly cloudy, 45°F, wind NNE 5 to 8 mph. Thursday: mostly cloudy then chance light rain, 60°F, wind E 6 to 9 mph.

WARNINGSNo weather or fire warnings in effect.

FIRENo wildfires or prescribed burns reported within 25 miles.

BURNINGCampfires and debris burning: check today's status with Michigan DNR.

ALGAENo clear-sky satellite image in the last three weeks. No bloom reports on record with Michigan DHHS.

LAUNCHESUnion Lake: status not listed, Union Lake: Open. Michigan DNR record updated 3 Apr 2026.

National Weather Service; National Interagency Fire Center; U.S. EPA CyAN satellite; Michigan DHHS; Michigan DNR. Weather, warnings, fires and satellite refresh when you open the page (checked at most hourly).

Depth map

17 contours, 5 to 110 ft

05910182030405058606568708090100110feet

Michigan DNR survey, fetched 7 Oct 2026. Not for navigation.

Size and depth

467 acres · deepest 110 ft (measured) · shoreline about 4.9 mi · clarity about 12 ft

Union Lake is the 7th largest of the 290 named lakes of 10 acres or more in Oakland County. By Michigan DNR survey it is the 5th deepest of the 104 with a measured depth. Its water is clearer than 192 of the other 248 lakes in the county with satellite clarity readings. Its shoreline measures about 4.9 miles along the state outline. About 0% of its area is deeper than 58 ft.

Ranks against Oakland County lakes in Michigan hydrography, Michigan DNR lake surveys and Michigan EGLE satellite clarity; shoreline measured from the state outline. How we measure

Getting on the water

2 public access sites on Union Lake.

Union Lake · Commerce Township

16 car spaces

Local boating rules, Oakland County

Union Lake · Proud Lake State Recreation Area · Open

2 ramp lanes · 21 trailer spaces · 1 car space · vault toilet · accessible restroom · Recreation Passport required

Local boating rules, Oakland County

Michigan DNR boating access, fetched 7 Oct 2026.

Fishing

Michigan DNR has stocked Union Lake 65 times since 1979. The most recent stocking was 52,652 walleye on 27 June 2023. Species stocked: brown trout, lake trout, rainbow trout, redear sunfish, splake, walleye.

65 stockings, 1979 to 2023, log scale

Latest: 27 Jun 2023: 52,652 walleye.

27 Jun 2023STOCKED52,652 walleye

15 Jun 2022STOCKED20,135 walleye

15 Jun 2022STOCKED20,432 walleye

11 Jul 2019STOCKED15,446 walleye

9 Jul 2019STOCKED71,023 walleye

28 Jun 2017STOCKED24,711 walleye

Source: Michigan DNR Fisheries, fetched 7 Oct 2026. How we measure

Where the deep water is

Show water deeper than

Measured from Michigan DNR contours. How we measure

Historically recorded species, from records through 1973: barred fantail darter, blackchin shiner, bluegill, bluntnose minnow, brindled madtom, brook silverside, central mudminnow, common shiner, green sunfish, iowa darter, johnny darter, lake herring, longnose gar, mimic shiner, mottled sculpin, rainbow darter, rock bass, sand shiner, smallmouth bass, spottail shiner, western banded killifish, yellow perch. Historic records, not a current survey.

Michigan Fish Atlas.

Water quality

Average water clarity is about 12 ft (Secchi depth 3.7 m, satellite readings 2018–23).

Clarity 12.1 ft of 110 ft

Michigan EGLE satellite clarity, fetched 7 Oct 2026.

Email me about Union LakeWhen it is stockedMichigan DNR has stocked Union Lake 65 times since 1979, most recently 52,652 walleye on 27 June 2023. None so far in 2026.When algae is reported or testedMichigan DHHS has no records for this lake yet. We email when the first one is posted.When satellite sees a bloom startEPA satellite, checked daily, June to October. We email when a bloom first shows on two clear days, not every day it stays. It has not happened in 2026.Any lake in Oakland CountyStockings and algae records on every lake in the county. In 2026 so far: 20 emails.

Union Lake has had no stockings or algae records in 2026, so its own alerts would have sent nothing this year. The county alert is on by default.

Email address

At most one email a week per lake. We email you a link to confirm before any alert is sent; every email has a one-click unsubscribe.

The area around Union Lake

75 other lakes of 10+ acres within about 6 miles of Union Lake, 15 with a page here (darker blue); 2 public launches in magenta. Sources: Michigan DNR, US Census Bureau.

Nearby lakes with measured depth

Long Lake12 ft deep · 0.8 mi · Oakland County

Cooley Lake56 ft deep · 0.9 mi · Oakland County

Green Lake72 ft deep · 1.4 mi · Oakland County

Middle Straits Lake55 ft deep · 1.9 mi · Oakland County

Lower Straits Lake21 ft deep · 1.9 mi · Oakland County

Round Lake15 ft deep · 2.0 mi · Oakland County

Michigan DNR survey; straight-line miles.

Common questions

How deep is Union Lake?

Union Lake is 110 feet at its deepest point, measured by Michigan DNR survey. It covers 467 acres.

Is there a public boat launch on Union Lake?

Yes. 2 public access sites are listed: Union Lake; Union Lake.

Is Union Lake stocked with fish?

Yes. Michigan DNR has stocked it 65 times since 1979, most recently 52,652 walleye on 27 June 2023.

How much of Union Lake is deeper than 10 feet?

About 60% of the lake's area is deeper than 10 feet, measured from Michigan DNR depth contours.