Upper Oconomowoc Lake
Upper Oconomowoc Lake in Waukesha County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 35 acres.
- Area
- 35 acres
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Why Upper Oconomowoc Lake 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 Upper Oconomowoc Lake, 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.
Upper Oconomowoc Lake is a 35-acre lake in Waukesha County, Wisconsin.
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 ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Upper Oconomowoc Lake
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 Upper Oconomowoc Lake
Compare lakeside cabins, hotels, and vacation rentals near Upper Oconomowoc Lake in Waukesha 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 35 acres |
No bathymetric survey has been published for Upper Oconomowoc Lake, so its depth is not documented here.
Recreation & Access
- Upper Oconomowoc LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Upper Oconomowoc Lake
Nearby Lakes in Waukesha County
Frequently asked questions about Upper Oconomowoc Lake
Where is Upper Oconomowoc Lake?
- Upper Oconomowoc Lake is a lake in Waukesha 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 Upper Oconomowoc Lake?
- Upper Oconomowoc Lake in Waukesha County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 35 acres.
Is Upper Oconomowoc Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Upper Oconomowoc Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Upper Oconomowoc Lake?
- Upper Oconomowoc Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Upper Oconomowoc Lake.
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Where this data comes from
Measurements for Upper Oconomowoc Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory