Flat Bay is a lake in St. Bernard County, Louisiana. Its water-quality measurements are published by LDEQ and shown on this page as reported.

Flat Bay

St. Bernard County, Louisiana358 acresView map Directions

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

Area

358 acres

Surface area

See the measurements Directions Where to stay

Flat Bay in St. Bernard County, Louisiana has water-quality measurements published by LDEQ, shown here as reported. Surface area: 358 acres.

Loading map…

Flat Bay is a 358-acre lake in St. Bernard County, Louisiana.

Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Flat Bay is safe to swim in today is a call for the Louisiana Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Get alerts for Flat Bay →

Water quality measurements for Flat Bay

These are the measurements LDEQ publishes for Flat Bay, 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 Flat Bay

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

Lake Details

Surface area

358 acres

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

Stays via Stay22

Stays near Flat Bay

Compare lakeside cabins, hotels, and vacation rentals near Flat Bay in St. Bernard County, Louisiana — 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 Flat Bay

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.

Follow Flat Bay’s readings

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

Or email

Fishing Flat Bay

→ Flat Bay fishing regulations (limits, seasons, special rules)

Nearby Lakes in St. Bernard County

Lake of the Mound2.4 miView →Blind Lagoon2.6 miView →Drum Lake2.8 miView →Lake Eugenie3.9 miView →Joe Shiman Pass3.6 miView →Halfmoon Lake4.1 miView →

Frequently asked questions about Flat Bay

Where is Flat Bay?: Flat Bay is a lake in St. Bernard County, Louisiana. Its water-quality measurements are published by LDEQ and shown on this page as reported.
What is the water quality of Flat Bay?: Flat Bay in St. Bernard County, Louisiana has water-quality measurements published by LDEQ, shown here as reported. Surface area: 358 acres.
Is Flat Bay safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.