Where is Willow Reservoir?

Willow Reservoir is a lake in Oneida County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.

Are there boat ramps on Willow Reservoir?

Willow Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Jerrys. Public access is listed as yes.

Can I fish at Willow Reservoir?

Willow Reservoir 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 Wisconsin's fish and wildlife agency, so check its current regulations before you go.

Willow Reservoir

Oneida County, Wisconsin4,880 acresView map Directions

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

Area

4,880 acres

Surface area

Shoreline

76.5 mi

Measured length

Impaired · Mercury
Public access

See the measurements Directions Where to stay

Willow Reservoir in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Surface area: 4880 acres.

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Willow Reservoir is a 4,880-acre lake in Oneida County, Wisconsin. Limited fish-species data available. Public access is available with 1 public boat landing.

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

What Willow Reservoir is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Big water4,880 acres

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Willow Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.

Whether Willow Reservoir is safe to swim in today is a call for the Wisconsin 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 Willow Reservoir

These are the measurements Wisconsin DNR publishes for Willow Reservoir, 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 Willow Reservoir

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

Lake Details

Surface area

4,880 acres

Shoreline

76.5 mi

Public access

Yes

Listed by Wisconsin DNR

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

Recreation & Access

Boat Landings

Yes

Public Access

JerrysPublic

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 Willow Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Willow Reservoir in Oneida County, Wisconsin — 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 Willow Reservoir

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Fishing Willow Reservoir

→ Willow Reservoir fishing regulations (limits, seasons, special rules)

EPA Impairment Status

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

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption.

Source: EPA ATTAINS assessment unit WI10007519 · Official waterbody report

Nearby Lakes in Oneida County

Skunk Lake2.9 miView →Lake Marie4.5 miView →Smith Lake5 miView →Pier Lake4 miView →Swamsauger Lake5.3 miView →Burrows Lake7.6 ft clear—View →

Frequently asked questions about Willow Reservoir

Where is Willow Reservoir?: Willow Reservoir is a lake in Oneida County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Willow Reservoir?: Willow Reservoir in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Surface area: 4880 acres.
Is Willow Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Willow Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Are there boat ramps on Willow Reservoir?: Willow Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Jerrys. Public access is listed as yes.
Can I fish at Willow Reservoir?: Willow Reservoir 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 Wisconsin's fish and wildlife agency, so check its current regulations before you go.