Lake Grady
Lake Grady in Hillsborough County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2 ft visibility. Phosphorus: 110 µg/L. Surface area: 120 acres.
- Clarity
- 2 ft
- Area
- 120 acres
- Trend
- ↓ Declining
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Why Lake Grady has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Grady, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by FDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Grady is a 120-acre lake in Hillsborough County, Florida. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-07-15. Grade methodology: LakeQuality methodology.
Watch Lake Grady water quality
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Swimming Safety
Not ratedBacteria advisory
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Grady
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2 ft of visibility. Phosphorus level: 110 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | 110 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Grady
Compare lakeside cabins, hotels, and vacation rentals near Lake Grady in Hillsborough County, Florida — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lake Grady
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 120 acres |
No bathymetric survey has been published for Lake Grady, so its depth is not documented here.
Fishing Lake Grady
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.543 m/yr | 3 |
| Phosphorus | ↓ Declining | +27.93 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Lake Grady is a man-made reservoir impounded by the Shadow Run Dam (completed 1969), built primarily for recreation on the Bell Creek; earth-type dam, 30 ft tall and 1,015 ft long.
- Surface area
- 120 ac
- Normal storage
- 750 ac-ft
- Max storage
- 3,119 ac-ft
- Drainage area
- 17.43 sq mi
- Hazard class
- High
- Owner
- SHADOW RUN DAM CORP
All listed purposes: Recreation;Fish and Wildlife Pond.
Source: USACE National Inventory of Dams, NID ID FL00176 · Operator website
EPA Impairment Status
Lake Grady is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit FL1660 · Official waterbody report · Matched by proximity (1.37 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Grady under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Rice Creek WwtfRiverview · 2.8 mi away · NPDES FL0122076Recent violation
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.
Graded lakes near Lake Grady
Lake Grady has no grade, but these lakes within a short drive do.
Nearby Lakes in Hillsborough County
Frequently asked questions about Lake Grady
Where is Lake Grady?
- Lake Grady is a lake in Hillsborough County, Florida. 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 Lake Grady?
- Lake Grady in Hillsborough County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2 ft visibility. Phosphorus: 110 µg/L. Surface area: 120 acres.
Is Lake Grady safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Grady is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake Grady across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples5 samples · 2025
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)