Newcastle Reservoir is a productive, nutrient-rich eutrophic lake in Iron County, Utah. Water quality is graded D based on 2 sampling years through 2020. Compared to the 7 other monitored lakes in Iron County, Newcastle Reservoir ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2020-07-28. Grade methodology: LakeGrade methodology.
Watch Newcastle Reservoir water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Moderate clarity, visible to about 9.5 ft. Chlorophyll-a: 89 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.5 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 89 µg/L | F |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Newcastle Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Newcastle Reservoir in Iron County, Utah — 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 Newcastle Reservoir
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 to Newcastle Reservoir?
Get lake water-quality report cards plus the best cabin & lodging deals near Newcastle Reservoir — straight to your inbox. No spam, unsubscribe anytime.
Fishing Newcastle Reservoir
Location
County Ranking
Ranked #8 of 8 lakes in Iron County
Cleaner Lakes Within 30 Miles
Newcastle Reservoir holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Iron County
Explore Newcastle Reservoir across LakeGrade
More Utah Lake Rankings
Other Grade D Lakes in Utah
Eutrophic Lakes in Utah
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-07-28
Monitoring stations: 1