Lake Delta is a lake in Bayfield County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.

Are there boat ramps on Lake Delta?

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

Lake Delta

Not yet rated

167 acres

Lake Delta in Bayfield County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 167 acres.

Wisconsin DNR rates Panfish as abundant on Lake Delta. DNR survey details →

Area: 167 acres
Public access: Yes

Where to stay →Safe to swim?

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DBear Lake2 ft clear · Bayfield CountyView →

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Why Lake Delta has no grade

We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Delta, no water-quality sampling on record for this lake.

Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.

Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.

Lake Delta is a 167-acre lake in Bayfield 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, last sampled recent years. Grade methodology: LakeQuality methodology.

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Swimming Safety

Not rated

Elevated nutrients

Not rated for swimming — there is not enough monitoring data to judge this lake

Compare the safest swimming lakes near Hayward →

Get alerts for Lake Delta →

Water quality measurements for Lake Delta

These readings exist but are not enough for an A–F grade — see why.

No clarity data. Trophic State Index: undefined.

Metric	Value	Grade
Water Clarity (Secchi Depth)	No recent samples
Phosphorus	No recent samples
Chlorophyll-a (Algae)	No recent samples
Trophic State Index (TSI)

Where to stay near Lake Delta

Compare lakeside cabins, hotels, and vacation rentals near Lake Delta in Bayfield 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 Lake Delta

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 Wisconsin’s top lakes →

DNR fisheries survey

Wisconsin DNR rates Panfish as abundant on Lake Delta.

A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Lake Delta — official chemistry is on file, not a letter. Catch rate is not a swim clearance and is not a weekly bite report.

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2019).

Fish Species (DNR-rated)

Panfish(Abundant)Largemouth Bass(Common)Northern Pike(Present)

Contour map (PDF) →Full WI DNR LakePage →Water quality stations →

DNR Reports & Resources

Wisconsin DNR Fisheries scientists publish multi-year survey reports for Lake Delta covering fish populations, stocking, water quality, and management. 1 report on file.

These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).

2023
Delta Lake spring shocking survey, 2023
Spring Shocking Survey · WI DNR · 2023 (PDF)

Lake Details

Characteristic	Value
Surface Area	167 acres
Public Access	Yes

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

Recreation & Access

Boat Landings

Yes

Public Access

Lake DeltaPublic

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

Fishing Lake Delta

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

Nearby Lakes in Bayfield County

NRSwede LakeView →DBear Lake2 ft clear · EutrophicView →NRSpirit LakeView →NRBear LakeView →NREverett LakeView →NRPhantom LakeView →

Frequently asked questions about Lake Delta

Where is Lake Delta?: Lake Delta is a lake in Bayfield County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Delta?: Lake Delta in Bayfield County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 167 acres.
Is Lake Delta safe to swim in?: Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Delta is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What did the DNR fisheries survey find at Lake Delta?: Wisconsin DNR rates Panfish as abundant on Lake Delta. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Lake Delta — official chemistry is on file, not a letter. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Lake Delta?: Lake Delta has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Delta. Public access is listed as yes.