Lake Maggiore
Lake Maggiore in Pinellas County, Florida has a water quality grade of C (Fair). Phosphorus: 50 µg/L. Surface area: 384 acres.
- Typical in August
- 86°F
- Max depth
- ~43 ft est.
- Area
- 384 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
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Lake Maggiore is a 384-acre productive, nutrient-rich eutrophic lake in Pinellas County, Florida with an estimated average depth of about 43 feet. Water quality is graded C based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 5 public boat landings. Compared to the 33 other monitored lakes in Pinellas County, Lake Maggiore ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-10. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria B
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Based on E. coli testing, Lake Maggiore rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 1.3% of 149 samples across 7 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Florida’s current beach and health-department advisories before swimming.
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 50 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 50 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Maggiore
Compare lakeside cabins, hotels, and vacation rentals near Lake Maggiore in Pinellas 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 Maggiore
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip? Cabins and lodging at Lake Maggiore → · more Florida lake trips
Water Temperature
Lake Maggiore typically sits around 86°F at the surface in August. Summer average is about 87°F. Usually warmest in Jul (about 88°F) and coldest in Dec (about 65°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 258 field readings (2010–2025) via the EPA Water Quality Portal. See the full Lake Maggiore water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~43 ft est. |
| Average Depth | ~10 ft est. |
| Surface Area | 384 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Florida has not published bathymetry for Lake Maggiore.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Lake Maggiore Park Boat RampPublic
- Bay Vista Park Boat RampPublic
- Maximo Park and Boat RampPublic
- Grandview Park Boat RampPublic
- O'Neill's MarinaSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Maggiore
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +19 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Lake Maggiore is a man-made reservoir impounded by the Lake Maggiore Operable Structure, built primarily for flood risk reduction on the Salt Creek; earth-type dam, 9 ft tall and 55 ft long.
- Surface area
- 384 ac
- Normal storage
- 769 ac-ft
- Max storage
- 2,031 ac-ft
- Hazard class
- Low
- Owner
- CITY OF ST. PETERSBURG
All listed purposes: Flood Risk Reduction;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID FL78000 · Operator website · Matched by proximity (0.97 km)
EPA Impairment Status
Lake Maggiore 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 FL1731A · Official waterbody report
County Ranking
Ranked #13 of 34 lakes in Pinellas County
Nearby Lakes With Higher Grades
Lake Maggiore holds Grade C. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Pinellas County
Frequently asked questions about Lake Maggiore
Where is Lake Maggiore?
- Lake Maggiore is a lake in Pinellas County, Florida. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Maggiore?
- Lake Maggiore in Pinellas County, Florida has a water quality grade of C (Fair). Phosphorus: 50 µg/L. Surface area: 384 acres.
Is Lake Maggiore safe to swim in?
- Based on E. coli testing, Lake Maggiore rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 1.3% of 149 samples across 7 seasons. That works out to a bacteria swim-safety grade of B — a historical summary of past testing, not a current reading. Lake Maggiore has a water quality grade of C (Fair). Bacteria levels can spike quickly after heavy rain, so always check Florida's current beach and health-department advisories before you swim.
What is the water temperature of Lake Maggiore?
- Lake Maggiore typically sits around 86°F at the surface in August, from 258 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
How deep is Lake Maggiore?
- No published bathymetric survey covers Lake Maggiore, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 43 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 384 acres.
Are there boat ramps on Lake Maggiore?
- Lake Maggiore has 5 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Lake Maggiore Park Boat Ramp, Bay Vista Park Boat Ramp, Maximo Park and Boat Ramp, Grandview Park Boat Ramp, among others. Public access is listed as yes.
Explore Lake Maggiore across LakeQuality
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Where this data comes from
105 measurements from 5 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples101 samples · 2020–2024
- Submitting organization not recorded for these samples4 samples · 2025
Monitoring station identifiers (5)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory