Reservoir Pond
Oconto County, WisconsinMesotrophic
Reservoir Pond carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.
The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. A maximum depth of 16 ft puts Reservoir Pond in the middle of Wisconsin's depth distribution. The lake's 413 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Reservoir Pond sits at rank 38 of 62 in Oconto County, in the lower half of the local distribution.
Eurasian watermilfoil is established at Reservoir Pond, which can dampen recreational access and pressure the native plant community. The fishery is bass-led, with 3 documented species across the lake's records. A documented public access point at Reservoir Pond makes the lake usable for shore fishing, paddle craft, and trailered boats. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-07-02. Grade methodology: LakeGrade methodology.
Watch Reservoir Pond water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 9.5 ft. Phosphorus level: 19.3 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.5 ft | C |
| Phosphorus | 19.3 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 16 ft |
| Surface Area | 413 acres |
| Public Access | Yes |
Fish Species
Click a species to see every graded lake where it is documented.
→ Best fishing times for Reservoir Pond (14-day solunar calendar)
→ Is it safe to eat fish from Reservoir Pond? (mercury & PFAS guide)
→ Reservoir Pond fishing regulations (limits, seasons, special rules)
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.727 m/yr | 6 |
| Phosphorus | ↑ Improving | -1.38 µg/L/yr | 4 |
Recreation & Access
Location
County Ranking
Ranked #38 of 62 lakes in Oconto County
Cleaner Lakes Within 30 Miles
Reservoir Pond holds Grade B. 4 nearby lakes hold higher grades.
- AExplosion LakeOconto County · mi · Higher grade (B → A)
- ABass LakeOconto County · mi · Higher grade (B → A)
- ABoot LakeOconto County · mi · Higher grade (B → A)
- ALittle Horn LakeOconto County · mi · Higher grade (B → A)
Nearby Lakes in Oconto County
More Wisconsin Lake Rankings
State Parks Near Reservoir Pond
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2003. 3 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Reservoir Info (USACE NID)
Reservoir Pond is a man-made reservoir impounded by the Reservoir (completed 1877), built primarily for recreation on the MCCASLIN BROOK; gravity-type dam, 15 ft tall and 212 ft long.
- Surface area
- 618 ac
- Normal storage
- 2,200 ac-ft
- Max storage
- 3,500 ac-ft
- Drainage area
- 18.8 sq mi
- Hazard class
- High
- Owner
- Oconto County
Source: USACE National Inventory of Dams, NID ID WI00163 · Operator website · Matched by proximity (0.57 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Fish and recreation data from Wisconsin DNR Lakes
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2025-07-02
Monitoring stations: 2
Where to stay near Reservoir Pond
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