Irisado Lake
Ocean County, New Jersey43 acresView mapDirections
NJDEP publishes the water-quality measurements for Irisado Lake. Here is what has been measured.
- Eutrophic
- Impaired · Impaired biota (cause unknown)
Irisado Lake in Ocean County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 3.1 ft visibility. Phosphorus: 26.3 µg/L. Chlorophyll-a (algae): 14.3 µg/L. Surface area: 43 acres.
Irisado Lake is a 43-acre productive, nutrient-rich eutrophic lake in Ocean County, New Jersey. Compared to the 5 other monitored lakes in Ocean County, Irisado Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-11-01. Methodology: how these readings are compared.
Swimming conditions
Readings onlyModerate algae
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.
Nutrient and algae readings are not a swimming clearance. Irisado Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), metals (other than mercury), pH / acidity. Check local advisories before you swim.
Whether Irisado Lake is safe to swim in today is a call for the New Jersey Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Irisado Lake
These are the measurements NJDEP publishes for Irisado Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 3.1 ft of visibility. Phosphorus 26.3 µg/L. Chlorophyll-a 14.3 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 26.3µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 14.3µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Irisado Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
43 acres
No bathymetric survey has been published for Irisado Lake, so its depth is not documented here.
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Fishing Irisado Lake
Reservoir Info (USACE NID)
Irisado Lake is a man-made reservoir impounded by the Rainbow Dam (completed 1938), built primarily for recreation on the Kettle Creek; earth-type dam, 13 ft tall and 700 ft long.
- Surface area
- 43 ac
- Normal storage
- 55 ac-ft
- Drainage area
- 5.8 sq mi
- Hazard class
- High
- Owner
- Township of Brick
Source: USACE National Inventory of Dams, NID ID NJ00092 · Operator website · Matched by proximity (0.45 km)
EPA Impairment Status
Irisado Lake 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: Drinking water, Aquatic life.
Source: EPA ATTAINS assessment unit NJ02040301050010-01 · Official waterbody report
Nearby Lakes in Ocean County
Frequently asked questions about Irisado Lake
Where is Irisado Lake?
- Irisado Lake is a lake in Ocean County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Irisado Lake?
- Irisado Lake in Ocean County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 3.1 ft visibility. Phosphorus: 26.3 µg/L. Chlorophyll-a (algae): 14.3 µg/L. Surface area: 43 acres.
Is Irisado Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Irisado Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), metals (other than mercury), pH / acidity. Check local advisories before you swim.
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Where this data comes from
48 measurements from 2 monitoring stations, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- NJDEP Bureau of Freshwater and Biological Monitoring
NJDEP_BFBM48 samples · 2020–2021
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (2)
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