Lake Maggiore
Pinellas County, Florida384 acresView mapDirections
Florida DEP publishes the water-quality measurements for Lake Maggiore. Here is what has been measured.
- Eutrophic
- Impaired · Algal growth
- 43 ft max depth
- Public access
Lake Maggiore in Pinellas County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Phosphorus: 50 µg/L. Surface area: 384 acres.
Lake Maggiore is a 384-acre productive, nutrient-rich eutrophic lake in Pinellas County, Florida with an estimated average depth of about 43 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. 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. Methodology: how these readings are compared.
Lake Maggiore covers about 380 acres in Pinellas County. It has one public boat landing. If you are planning to stay, you can search lake houses and cabins around Lake Maggiore on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
What Lake Maggiore is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyRecreation use not supported
Based on clarity and algae readings from past sampling — there is no 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.
Whether Lake Maggiore is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Maggiore
These are the measurements Florida DEP publishes for Lake Maggiore, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 50 µg/L. TSI 61.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 50µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 61 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Maggiore
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Lake Maggiore typically sits around 79°F at the surface in October. 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.
Column height runs from this lake’s coldest month (65°F) to its warmest (88°F).
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
Max depth
~43 ft est.
Surface area
384 acres
Public access
Yes
Listed by Florida DEP
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
Watershed (drainage) area
2 sq mi
HydroLAKES / HydroSHEDS
Shoreline
3 mi
HydroLAKES / HydroSHEDS
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
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays 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
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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
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Fishing Lake Maggiore
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Phosphorus
Worsening+19 µg/L/yr5 years
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
Designated uses not supporting: Aquatic life, Recreation.
Source: EPA ATTAINS assessment unit FL1731A · Official waterbody report
Nearby Lakes in Pinellas County
Frequently asked questions about Lake Maggiore
Where is Lake Maggiore?
- Lake Maggiore is a lake in Pinellas County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Lake Maggiore?
- Lake Maggiore in Pinellas County, Florida has water-quality measurements published by Florida DEP, shown here as reported. 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 is a historical summary of past bacteria testing, not a current reading and not a swimming clearance. Bacteria levels can spike quickly after heavy rain, so whether Lake Maggiore is safe to swim in today is a call for Florida's water agency and the county health department; check their current beach advisories before you swim.
What is the water temperature of Lake Maggiore?
- Lake Maggiore typically sits around 79°F at the surface in October, 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 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Maggiore Park Boat Ramp. Public access is listed as yes.
Can I fish at Lake Maggiore?
- Lake Maggiore has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Florida's fish and wildlife agency, so check its current regulations before you go.
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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from 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