Iona Lake is a lake in Carroll County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.

How deep is Iona Lake?

Iona Lake has a maximum depth of 30 feet and an average depth of 16.4 feet. The lake covers 68 acres.

Are there campgrounds on Iona Lake?

Iona Lake has 1 public campground from USGS The National Map within 5 km, including White Ledge Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.

Iona Lake

Carroll County, New Hampshire68 acresView map Directions

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

Max depth

30 ft

Bathymetric survey

Area

68 acres

Surface area

Shoreline

2 mi

Measured length

Impaired · Mercury
30 ft max depth

See the measurements Directions Where to stay

Iona Lake in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 30 ft. Surface area: 68 acres.

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Iona Lake is a 68-acre lake in Carroll County, New Hampshire with a maximum depth of 30 feet (16-foot average).

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

What Iona Lake is good for

From access and monitoring records, not editorial picks.

Camping1 public campground nearby
Deep water30 ft surveyed max depth

Swimming conditions

No reading

Not rated

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

Whether Iona Lake is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Iona Lake

These are the measurements NHDES publishes for Iona 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 Iona Lake

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

Lake Details

Max depth

30 ft

Average depth

16.4 ft

Surface area

68 acres

Shoreline

2 mi

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

Recreation & Access

Campgrounds

Public campgrounds near Iona Lake

White Ledge Campground1.1 kmReserve

Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes

Stays via Stay22

Stays near Iona Lake

Compare lakeside cabins, hotels, and vacation rentals near Iona Lake in Carroll County, New Hampshire — 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 Iona Lake

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

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Fishing Iona Lake

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

EPA Impairment Status

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

Causes of impairment

MercurypH / acidity

Designated uses not supporting: Aquatic life, Fish consumption.

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

Source: EPA ATTAINS assessment unit NHLAK600020303-03 · Official waterbody report

Nearby Lakes in Carroll County

Whitton Pond1.1 miView →Chocorua Lake4.1 miView →Pequawket Pond3.4 miView →Little Lake-Deep Spot4.5 miView →Middle Pea Porridge Pond-Deep SpotOligotrophic3.6 miView →Big Pea Porridge Pond-Deep SpotMesotrophic4.2 miView →

Frequently asked questions about Iona Lake

Where is Iona Lake?: Iona Lake is a lake in Carroll County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Iona Lake?: Iona Lake in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 30 ft. Surface area: 68 acres.
Is Iona Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Iona Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
How deep is Iona Lake?: Iona Lake has a maximum depth of 30 feet and an average depth of 16.4 feet. The lake covers 68 acres.
Are there campgrounds on Iona Lake?: Iona Lake has 1 public campground from USGS The National Map within 5 km, including White Ledge Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.