Where is Lake Flaherty?

Lake Flaherty is a lake in Jackson County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.

How deep is Lake Flaherty?

Lake Flaherty has a maximum depth of 6.2 feet. The lake covers 417 acres.

Lake Flaherty

Jackson County, Minnesota417 acresView map Directions

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

Max depth

6.2 ft

Bathymetric survey

Area

417 acres

Surface area

Shoreline

3.9 mi

Measured length

Impaired · Nutrients (phosphorus, nitrogen)
6 ft max depth

See the measurements Directions Where to stay

Lake Flaherty in Jackson County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 6.2 ft. Surface area: 417 acres.

Loading map…

Lake Flaherty is a 417-acre lake in Jackson County, Minnesota with a maximum depth of 6 feet.

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

Swimming conditions

No reading

Recreation use not supported

Nutrient and algae readings are not a swimming clearance. Lake Flaherty is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether Lake Flaherty is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Compare swimming lakes near Mankato →

Get alerts for Lake Flaherty →

Water quality measurements for Lake Flaherty

These are the measurements Minnesota PCA publishes for Lake Flaherty, 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 Lake Flaherty

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

Lake Details

Max depth

6.2 ft

Surface area

417 acres

Shoreline

3.9 mi

The depth above comes from a bathymetric survey of this lake, not from a regional estimate.

Stays via Stay22

Stays near Lake Flaherty

Compare lakeside cabins, hotels, and vacation rentals near Lake Flaherty in Jackson County, Minnesota — 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 Lake Flaherty

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 Minnesota’s top lakes →

Follow Lake Flaherty’s readings

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

Or email

Fishing Lake Flaherty

→ Lake Flaherty fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Lake Flaherty is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Nutrients (phosphorus, nitrogen)

Designated uses not supporting: Recreation.

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

Source: EPA ATTAINS assessment unit MN32-0045-00 · Official waterbody report

Nearby Lakes in Jackson County

Teal Lake2.9 miView →South Heron Lake2.5 miView →Timber Lake5.2 miView →Heron Lake4.2 miView →Heron Lake1 ft clear7.3 miView →Boot Lake7.2 miView →

Frequently asked questions about Lake Flaherty

Where is Lake Flaherty?: Lake Flaherty is a lake in Jackson County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Lake Flaherty?: Lake Flaherty in Jackson County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 6.2 ft. Surface area: 417 acres.
Is Lake Flaherty safe to swim in?: Nutrient and algae readings are not a swimming clearance. Lake Flaherty is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Lake Flaherty?: Lake Flaherty has a maximum depth of 6.2 feet. The lake covers 417 acres.