Marble Lake, Branch County, MI: Depth Map, Fishing & Water Quality

Where it is

2 miles southwest of Quincy

Branch County, Michigan · 41.9115° N, 84.9033° W

Directions open in Google or Apple Maps, to the Michigan DNR public access site.

Today on the lake

Updated 14 Oct 2026, 6:23 pm EDT. Get alerts for Marble Lake

WEATHERTonight: mostly cloudy, 49°F, wind NE 5 to 10 mph. Thursday: chance rain showers then chance showers and thunderstorms, 63°F, wind E 10 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.

ALGAECAUTION Satellite detected cyanobacteria across about 42% of the lake on 13 Oct 2026, the latest clear-sky image.

LAUNCHESMarble Lake: listed 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

7 contours, 5 to 60 ft

05102030405060feet

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

Size and depth

741 acres · deepest 60 ft (measured) · shoreline about 16.1 mi · clarity about 5 ft

Marble Lake is the 2nd largest of the 76 named lakes of 10 acres or more in Branch County. By Michigan DNR survey it is the 4th deepest of the 22 with a measured depth. Its water is clearer than 11 of the other 62 lakes in the county with satellite clarity readings. Its shoreline measures about 16.1 miles along the state outline. About 33% of its area is deeper than 30 ft.

Ranks against Branch 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

1 public access site on Marble Lake.

Marble Lake · Open

2 ramp lanes · 50 trailer spaces · vault toilet · accessible restroom · Recreation Passport required

Local boating rules, Branch County

Michigan DNR boating access, fetched 7 Oct 2026.

Water quality

Average water clarity is about 5 ft (Secchi depth 1.6 m, satellite readings 2018–23).

Clarity 5.1 ft of 60 ft

Michigan EGLE satellite clarity, fetched 7 Oct 2026.

CAUTION The highest toxin level measured here was microcystin at 0.7 ppb on 31 July 2024, 0 times the EPA swimming guideline of 8 ppb. 1 water samples are on record, the latest from 31 July 2024. Check current advisories before swimming.

Source: Michigan DHHS harmful algal bloom sampling; U.S. EPA 2019 recreational criteria. Fetched 7 Oct 2026.

The area around Marble Lake

13 other lakes of 10+ acres within about 6 miles of Marble Lake, 1 with a page here (darker blue); 1 public launch in magenta. Sources: Michigan DNR, US Census Bureau.

Nearby lakes with measured depth

Lake Bartholomew56 ft deep · 2.6 mi · Branch County

Loon Lake16 ft deep · 3.9 mi · Branch County

East Long Lake45 ft deep · 5.0 mi · Branch County

Hemlock Lake60 ft deep · 5.7 mi · Hillsdale County

SHARP40 ft deep · 5.7 mi · Hillsdale County

Coldwater Lake90 ft deep · 6.9 mi · Branch County

Michigan DNR survey; straight-line miles.

Common questions

How deep is Marble Lake?

Marble Lake is 60 feet at its deepest point, measured by Michigan DNR survey. It covers 741 acres.

Is there a public boat launch on Marble Lake?

Yes. 1 public access site is listed: Marble Lake.

How much of Marble Lake is deeper than 10 feet?

About 100% of the lake's area is deeper than 10 feet, measured from Michigan DNR depth contours.

Has Marble Lake had toxic algae?

The highest toxin level measured was microcystin at 0.7 ppb (31 July 2024). Check current advisories before swimming.