What is the water quality grade for Mona Reservoir?

Mona Reservoir in Juab County, Utah received a water quality grade of C (Fair). Water clarity: 2 ft visibility. Chlorophyll-a (algae): 4.3 µg/L.

Is Mona Reservoir safe to swim in?

Generally safe for swimming, moderate water quality. Mona Reservoir has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 4.3 µg/L. Always check local health department advisories before swimming.

Juab County, Utah

Mona Reservoir

Grade CFair · 2 ft clarity

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Eutrophic

Mona Reservoir is a productive, nutrient-rich eutrophic lake in Juab County, Utah. Water quality is graded C based on 2 sampling years through 2024. Compared to the 4 other monitored lakes in Juab County, Mona Reservoir ranks #2 for water quality.

Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2024-09-05. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Very murky, less than 2 ft of visibility. Chlorophyll-a: 4.3 µg/L. Trophic State Index: 56.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2 ft	F
Phosphorus	No data
Chlorophyll-a (Algae)	4.3 µg/L	A
Trophic State Index (TSI)	56	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Mona Reservoir

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Fishing Mona Reservoir

→ Mona Reservoir fishing regulations (limits, seasons, special rules)

Location

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County Ranking

Ranked #2 of 5 lakes in Juab County

Cleaner Lakes Within 30 Miles

Mona Reservoir holds Grade C. 2 nearby lakes hold higher grades.

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Nearby Lakes in Juab County

Yuba Reservoir Midway

Utah Lake Goshen Bay Southwest End

Explore Mona Reservoir across LakeGrade

Lake Fishing Forecast

Species activity outlook by water temperature and season

Eutrophic Lakes

High nutrients, frequent algae, reduced clarity

The State of Utah's Lakes

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Other Grade C Lakes in Utah

Gunnison Reservoir

Sanpete County · Clarity: 0.8 ft

Nla Lake

Sanpete County · Clarity: 2.6 ft

Dmad Reservoir

Millard County · Clarity: 0.7 ft

Dmad Reservoir N of Cut

Millard County · Clarity: 0.7 ft

Jordenelle Marina Lake

Wasatch County · Clarity: 8.3 ft

Gunnison Bend Reservoir

Millard County · Clarity: 1.5 ft

Eutrophic Lakes in Utah

Gunnison Reservoir Dmad Reservoir Dmad Reservoir N of Cut Nla Lake

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: 2024-09-05

Monitoring stations: 2

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