Irisado Lake
Irisado Lake in Ocean County, New Jersey has a water quality grade of C (Fair). Water clarity: 3.1 ft visibility. Phosphorus: 26.3 µg/L. Chlorophyll-a (algae): 14.3 µg/L. Surface area: 43 acres.
- Clarity
- 3.1 ft
- Area
- 43 acres
- Type
- Eutrophic
Irisado Lake is a 43-acre productive, nutrient-rich eutrophic lake in Ocean County, New Jersey. Water quality is graded C based on 2 sampling years through 2021. 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. Grade methodology: LakeGrade methodology.
Watch Irisado Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyBacteria advisory
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Very murky, less than 3.1 ft of visibility. Phosphorus level: 26.3 µg/L. Chlorophyll-a: 14.3 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | Not graded |
| Phosphorus | 26.3 µg/L | Good |
| Chlorophyll-a (Algae) | 14.3 µg/L | Fair |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Irisado Lake
Compare lakeside cabins, hotels, and vacation rentals near Irisado Lake in Ocean County, New Jersey — 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 Irisado Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 43 acres |
No bathymetric survey has been published for Irisado Lake, so its depth is not documented here.
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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NJ02040301040020-01 · Official waterbody report · Matched by proximity (1.67 km)
County Ranking
Ranked #5 of 6 lakes in Ocean County
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. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Irisado Lake?
- Irisado Lake in Ocean County, New Jersey has a water quality grade of C (Fair). 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?
- Generally safe for swimming, moderate water quality. Irisado Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 14.3 µg/L. Always check local health department advisories before swimming.
Explore Irisado Lake across LakeGrade
More New Jersey Lake Rankings
Other Grade C Lakes in New Jersey
Eutrophic Lakes in New Jersey
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)
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