Lake Lemon
Monroe County, Indiana1,650 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
Lake Lemon in Monroe County, Indiana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.1 ft visibility. Surface area: 1650 acres.
- Clarity
- 2.1 ft
- Area
- 1,650 acres
- Trend
- ↓ Declining
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Stays near Lake Lemon
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Watch Lake Lemon’s letter
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Why Lake Lemon has no grade
Lake Lemon 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, Lake Lemon is Not Rated — not an F. Its 2.1-foot median from 5 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 IDEM and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Lemon is a 1,650-acre lake in Monroe County, Indiana. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, IDEM, last sampled 2023-07-26. Grade methodology: LakeQuality methodology.
What Lake Lemon is good for
From access and monitoring records, not editorial picks.
- Big water1,650 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lake Lemon
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.1 ft of visibility. TSI 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,650 acres |
No bathymetric survey has been published for Lake Lemon, so its depth is not documented here.
Fishing Lake Lemon
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.017 m/yr | 2 |
Reservoir Info (USACE NID)
Lake Lemon is a man-made reservoir impounded by the Lake Lemon Dam (completed 1952), built primarily for water supply on the BEANBLOSSOM CREEK; earth-type dam, 51 ft tall and 660 ft long.
- Surface area
- 1,650 ac
- Normal storage
- 13,300 ac-ft
- Max storage
- 45,700 ac-ft
- Drainage area
- 70.9 sq mi
- Hazard class
- High
- Owner
- Bob Madden
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID IN00010 · Operator website
Regulated Pollution Sources Nearby
8 EPA-permitted facilities operate within about 5 miles of Lake Lemon under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Camp Gallahue WwtpFruitdale · 3.4 mi away · NPDES IN0053899Recent violation
- Lake Lemon North Shore Dredge Disposal ProjectUnionville · 1 mi away · NPDES INRA06482
- Lake Lemon Dredge DisposalUnionville · 1.2 mi away · NPDES INRA05878
- Lake Lemon Disposal BasinUnionville · 1.5 mi away · NPDES INRA07207
- Duke Energy Needmore Junction Substation RebuildNashville · 2.8 mi away · NPDES INRA06601
- Lutheran Hills CampTrevlac · 3.2 mi away · NPDES IN0039110
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Monroe County
Frequently asked questions about Lake Lemon
Where is Lake Lemon?
- Lake Lemon is a lake in Monroe County, Indiana. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Lake Lemon?
- Lake Lemon in Monroe County, Indiana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.1 ft visibility. Surface area: 1650 acres.
Is Lake Lemon safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Lake Lemon across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
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Where this data comes from
5 measurements 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
NALMS5 samples · 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.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)