Lake Powell Goodhope Bay Midchannel
Garfield County, UtahView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from D at the last regrade
- Eutrophic
- #5 of 10 in the county
Lake Powell Goodhope Bay Midchannel in Garfield County, Utah has a water quality grade of B (Good). Water clarity: 6.1 ft visibility. Phosphorus: 26 µg/L.
- Clarity
- 6.1 ft
- Type
- Eutrophic
- Phosphorus
- 26 µg/L
- Trend
- ↓ Declining
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Watch Lake Powell Goodhope Bay Midchannel’s letter
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Lake Powell Goodhope Bay Midchannel is a productive, nutrient-rich eutrophic lake in Garfield County, Utah. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 9 other monitored lakes in Garfield County, Lake Powell Goodhope Bay Midchannel ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2025-06-25. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLow algae
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.
The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Murky, only visible to about 6.1 ft. Phosphorus 26 µg/L. TSI 51. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.1 ft | Not graded |
| Phosphorus | 26 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Lake Powell Goodhope Bay Midchannel
Water Quality Trend: ↓ Declining
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.214 m/yr | 8 |
| Phosphorus | ↓ Declining | +0.67 µg/L/yr | 5 |
County Ranking
Ranked #5 of 10 lakes in Garfield County
Nearby Lakes in Garfield County
Frequently asked questions about Lake Powell Goodhope Bay Midchannel
Where is Lake Powell Goodhope Bay Midchannel?
- Lake Powell Goodhope Bay Midchannel is a lake in Garfield County, Utah. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Powell Goodhope Bay Midchannel?
- Lake Powell Goodhope Bay Midchannel in Garfield County, Utah has a water quality grade of B (Good). Water clarity: 6.1 ft visibility. Phosphorus: 26 µg/L.
Is Lake Powell Goodhope Bay Midchannel safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Lake Powell Goodhope Bay Midchannel across LakeQuality
3.1 mi away · recorded at 68°F
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
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More Utah Lake Rankings
Other Grade B Lakes in Utah
Eutrophic Lakes in Utah
Where this data comes from
205 measurements from 1 monitoring station, 2012–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX205 samples · 2012–2025
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- Turbidiy determined in the field
Monitoring station identifiers (1)
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.