Where is Grand Marais?

Grand Marais is a lake in Union County, Arkansas. Its water-quality measurements are published by Arkansas DEQ and shown on this page as reported.

Grand Marais

Union County, Arkansas610 acresView map Directions

No nutrient or algae sampling on record from Arkansas DEQ for this lake.

Area

610 acres

Surface area

Impaired · Mercury

See the measurements Directions Where to stay

Grand Marais in Union County, Arkansas has water-quality measurements published by Arkansas DEQ, shown here as reported. Surface area: 610 acres.

Loading map…

Grand Marais is a 610-acre lake in Union County, Arkansas.

Source: EPA Water Quality Portal sampling records, ADEQ. Methodology: how these readings are compared.

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Grand Marais is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.

Whether Grand Marais is safe to swim in today is a call for the Arkansas Division of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Get alerts for Grand Marais →

Water quality measurements for Grand Marais

These are the measurements Arkansas DEQ publishes for Grand Marais, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about Grand Marais

Answers come straight from the public measurements and survey records on this page.

Lake Details

Surface area

610 acres

No bathymetric survey has been published for Grand Marais, so its depth is not documented here.

Stays via Stay22

Stays near Grand Marais

Compare lakeside cabins, hotels, and vacation rentals near Grand Marais in Union County, Arkansas — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Grand Marais

Prices for Oct 16–18, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a whole trip? See where to stay at Arkansas’s top lakes →

Follow Grand Marais’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Grand Marais

→ Grand Marais fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Grand Marais is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit AR_08040202_4170 · Official waterbody report

Nearby Lakes in Union County

Fesenthal Lake1.5 miView →Forty Acre Millpond2.4 miView →Open Brake3.1 miView →Little Lake4.1 miView →Open Brake4.4 miView →Jones Lake—View →

Frequently asked questions about Grand Marais

Where is Grand Marais?: Grand Marais is a lake in Union County, Arkansas. Its water-quality measurements are published by Arkansas DEQ and shown on this page as reported.
What is the water quality of Grand Marais?: Grand Marais in Union County, Arkansas has water-quality measurements published by Arkansas DEQ, shown here as reported. Surface area: 610 acres.
Is Grand Marais safe to swim in?: Nutrient and algae readings are not a swimming clearance. Grand Marais is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.