Where is Sunken Island Lake?

Sunken Island Lake is a lake in Pocahontas County, Iowa. Its water-quality measurements are published by Iowa DNR and shown on this page as reported.

Are there boat ramps on Sunken Island Lake?

Sunken Island Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Leo Shimon Marsh. Public access is listed as yes.

Can I fish at Sunken Island Lake?

Sunken Island Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Iowa's fish and wildlife agency, so check its current regulations before you go.

Sunken Island Lake

Pocahontas County, Iowa135 acresView map Directions

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

Area

135 acres

Surface area

Shoreline

2.8 mi

Measured length

Impaired · pH / acidity
Public access

See the measurements Directions Where to stay

Sunken Island Lake in Pocahontas County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Surface area: 135 acres.

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Sunken Island Lake is a 135-acre lake in Pocahontas County, Iowa. Limited fish-species data available. Public access is available with 1 public boat landing.

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

What Sunken Island Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Sunken Island Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.

Whether Sunken Island Lake is safe to swim in today is a call for the Iowa Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Sunken Island Lake

These are the measurements Iowa DNR publishes for Sunken Island Lake, 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 Sunken Island Lake

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

Lake Details

Surface area

135 acres

Shoreline

2.8 mi

Public access

Yes

Listed by Iowa DNR

No bathymetric survey has been published for Sunken Island Lake, so its depth is not documented here.

Recreation & Access

Boat Landings

Yes

Public Access

Leo Shimon MarshPublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

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Stays near Sunken Island Lake

Compare lakeside cabins, hotels, and vacation rentals near Sunken Island Lake in Pocahontas County, Iowa — 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 Sunken Island Lake

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Fishing Sunken Island Lake

→ Sunken Island Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Sunken Island Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

pH / acidity

Designated uses not supporting: Aquatic life.

Source: EPA ATTAINS assessment unit IA 04-RAC-1174 · Official waterbody report

Nearby Lakes in Pocahontas County

Clear Lake7 miView →Lizard Lake—View →Newell Pit Lake4.1 ft clear · Eutrophic7.1 miView →Pickerel Lake19 miView →Storm Lake Max Depth1.7 ft clear · Eutrophic15.3 miView →South Twin Lake17.4 miView →

Frequently asked questions about Sunken Island Lake

Where is Sunken Island Lake?: Sunken Island Lake is a lake in Pocahontas County, Iowa. Its water-quality measurements are published by Iowa DNR and shown on this page as reported.
What is the water quality of Sunken Island Lake?: Sunken Island Lake in Pocahontas County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Surface area: 135 acres.
Is Sunken Island Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Sunken Island Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Are there boat ramps on Sunken Island Lake?: Sunken Island Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Leo Shimon Marsh. Public access is listed as yes.
Can I fish at Sunken Island Lake?: Sunken Island Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Iowa's fish and wildlife agency, so check its current regulations before you go.