Crystal-Morgan Lake is a mesotrophic lake in Morgan County, Missouri. Water quality is graded B based on 3 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 37 other monitored lakes in Morgan County, Crystal-Morgan Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-08-20. Grade methodology: LakeGrade methodology.
Watch Crystal-Morgan Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 6.2 ft. Phosphorus level: 15.5 µg/L. Chlorophyll-a: 3.1 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.2 ft | D |
| Phosphorus | 15.5 µg/L | A |
| Chlorophyll-a (Algae) | 3.1 µg/L | A |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Crystal-Morgan Lake
Compare lakeside cabins, hotels, and vacation rentals near Crystal-Morgan Lake in Morgan County, Missouri — 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 Crystal-Morgan Lake
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Fishing Crystal-Morgan Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.2 m/yr | 3 |
| Phosphorus | ↑ Improving | -1.5 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -0.5 µg/L/yr | 3 |
Water Temperature
Crystal-Morgan Lake averages about 79°F at the surface in summer, usually warmest in Jul (about 81°F) and coldest in May (about 75°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 16 field readings (2022–2024) via the EPA Water Quality Portal. See the full Crystal-Morgan Lake water temperature breakdown →
Location
County Ranking
Ranked #2 of 38 lakes in Morgan County
Nearby Lakes in Morgan County
Explore Crystal-Morgan Lake across LakeGrade
Species activity outlook by water temperature and season
Top lakes and where to stay in the Lake of the Ozarks area
Where to stay at Missouri's top lakes, each with its grade
Moderate nutrients, good water quality
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More Missouri Lake Rankings
Other Grade B Lakes in Missouri
More records, surveys & data sources
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Crystal-Morgan Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Stover Southwest WwtpStover · 4.2 mi away · NPDES MO0047058Recent violation
- Ozark Recycling Center LlcVersailles · 4 mi away · NPDES MONX00596
- Stover Northwest WwtfStover · 4.3 mi away · NPDES MO0047040
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-08-20
Monitoring stations: 1