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B

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.

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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.

MetricValueGrade
Water Clarity (Secchi Depth)9.5 ftC
Phosphorus19.3 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)46Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth16 ft
Surface Area413 acres
Public AccessYes

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.

Banded Mystery SnailChinese Mystery SnailEurasian Water-Milfoil

Water Quality Trend: Stable

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.727 m/yr6
Phosphorus Improving-1.38 µg/L/yr4
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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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.

See full comparison →

Nearby Lakes in Oconto County

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)

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

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

Compare lakeside cabins, hotels, and vacation rentals near Reservoir Pond in Oconto County, Wisconsin — live availability and prices for your trip.

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