City Millpond
Green Lake County, Wisconsin7,920 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for City Millpond. Here is what has been measured.
- 4 aquatic invasives
- 236 ft max depth
- Public access
- Limited data
City Millpond in Green Lake County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Phosphorus: 38.4 µg/L. Maximum depth: 236 ft. Surface area: 7920 acres.
Wisconsin DNR lists Smallmouth Bass as common on City Millpond. DNR survey details →
City Millpond is a 7,920-acre lake in Green Lake County, Wisconsin with a maximum depth of 236 feet. The lake supports 7 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Public access is available with 2 public boat landings and 3 public beaches.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-06-05. Methodology: how these readings are compared.
What City Millpond is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Beach3 documented beaches
- Fishing7 species recorded
- Deep water236 ft surveyed max depth
- Big water7,920 acres
Swimming conditions
No readingBacteria tested: low
Based on E. coli testing, City Millpond rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 3.1% of 98 samples across 9 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Wisconsin’s current beach and health-department advisories before swimming.
Whether City Millpond 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.
Water quality measurements for City Millpond
These are the measurements Wisconsin DNR publishes for City Millpond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 38.4 µg/L. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 38.4µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about City Millpond
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Smallmouth Bass as common on City Millpond.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows City Millpond’s water-quality measurements separately. 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. 85 stations on file (most recent sample 2026).
Fish Species (DNR-rated)
Lake Details
Max depth
236 ft
Surface area
7,920 acres
Public access
Yes
Listed by Wisconsin DNR
Recreation & Access
- Canal StreetPublic
- Hattie Sherwood ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near City Millpond
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Fish Species
Click a species to see every lake where it is documented.
Fishing City Millpond
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Reservoir Info (USACE NID)
City Millpond is a man-made reservoir impounded by the Upper Green Lake (completed 1869), built primarily for recreation on the PUCHYAN; gravity-type dam, 8 ft tall and 200 ft long.
- Surface area
- 7,346 ac
- Normal storage
- 30,000 ac-ft
- Max storage
- 40,000 ac-ft
- Drainage area
- 115 sq mi
- Hazard class
- High
- Owner
- City Of Green Lake
Source: USACE National Inventory of Dams, NID ID WI00633 · Operator website · Matched by proximity (0.46 km)
Nearby Lakes in Green Lake County
Frequently asked questions about City Millpond
Where is City Millpond?
- City Millpond is a lake in Green Lake County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of City Millpond?
- City Millpond in Green Lake County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Phosphorus: 38.4 µg/L. Maximum depth: 236 ft. Surface area: 7920 acres.
Is City Millpond safe to swim in?
- Based on E. coli testing, City Millpond rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 3.1% of 98 samples across 9 seasons. That is a historical summary of past bacteria testing, not a current reading and not a swimming clearance. Bacteria levels can spike quickly after heavy rain, so whether City Millpond is safe to swim in today is a call for Wisconsin's water agency and the county health department; check their current beach advisories before you swim.
How deep is City Millpond?
- City Millpond has a maximum depth of 236 feet. The lake covers 7920 acres.
What fish are in City Millpond?
- Fish species found in City Millpond include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Trout, Walleye, Catfish. City Millpond is located in Green Lake County, Wisconsin.
What did the DNR fisheries survey find at City Millpond?
- Wisconsin DNR lists Smallmouth Bass as common on City Millpond. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows City Millpond’s water-quality measurements separately. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on City Millpond?
- City Millpond has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Canal Street, Hattie Sherwood Park. Public access is listed as yes.
Can I fish at City Millpond?
- City Millpond has 2 documented boat landings 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.
Explore City Millpond across LakeQuality
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Where this data comes from
7 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX7 samples · 2024
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory