Central Park Lake
Jones County, Iowa25 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Central Park Lake in Jones County, Iowa is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.6 ft visibility. Surface area: 25 acres.
- Clarity
- 1.6 ft
- Area
- 25 acres
- Trend
- ↓ Declining
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Stays near Central Park Lake
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Watch Central Park Lake’s letter
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Free interactive depth-contour map of Central Park Lake, reaching a maximum surveyed depth of 16 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Iowa DNR.
Why Central Park Lake has no grade
Central Park Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Central Park Lake is Not Rated — not an F. Its 1.6-foot median from 1 readings collected 2023 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by Iowa DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Central Park Lake is a 25-acre lake in Jones County, Iowa. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2023-07-17. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Central Park Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.6 ft of visibility. TSI 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 25 acres |
No bathymetric survey has been published for Central Park Lake, so its depth is not documented here.
Fishing Central Park Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.254 m/yr | 4 |
| Phosphorus | ↓ Declining | +74.25 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +2.47 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Central Park Lake is a man-made reservoir impounded by the Central Park Lake Dam (completed 1965), built primarily for recreation on the TR-MINERAL CREEK; earth-type dam, 23 ft tall and 665 ft long.
- Surface area
- 25 ac
- Normal storage
- 300 ac-ft
- Max storage
- 481 ac-ft
- Drainage area
- 0.62 sq mi
- Hazard class
- Low
- Owner
- Jones County Conservation Board
Source: USACE National Inventory of Dams, NID ID IA00561 · Operator website
Graded lakes near Central Park Lake
Central Park Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Jones County
Frequently asked questions about Central Park Lake
Where is Central Park Lake?
- Central Park Lake is a lake in Jones County, Iowa. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Central Park Lake?
- Central Park Lake in Jones County, Iowa is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.6 ft visibility. Surface area: 25 acres.
Is Central Park Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Central Park Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS1 sample · 2023
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.