Alpine Lake
Warren County, Missouri325 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Oligotrophic
- #4 of 16 in the county
Alpine Lake in Warren County, Missouri has a water quality grade of A (Excellent). Water clarity: 12.6 ft visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Surface area: 325 acres.
- Clarity
- 12.6 ft
- Typical in September
- 77°F
- Area
- 325 acres
- Type
- Oligotrophic
- Phosphorus
- 7 µg/L
- Chlorophyll-a
- 1.5 µg/L
- Trend
- ↑ Improving
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Watch Alpine Lake’s letter
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Alpine Lake is a 325-acre cold, clear oligotrophic lake in Warren County, Missouri. Water quality is graded A based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 15 other monitored lakes in Warren County, Alpine Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-14. Grade methodology: LakeQuality methodology.
What Alpine Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12.6 ft of visibility
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 A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 12.6 ft. Phosphorus 7 µg/L. Chlorophyll-a 1.5 µg/L. TSI 36. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.6 ft | Not graded |
| Phosphorus | 7 µg/L | Good |
| Chlorophyll-a (Algae) | 1.5 µg/L | Good |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Water Temperature
Alpine Lake typically sits around 77°F at the surface in September. Summer average is about 81°F. Usually warmest in Jul (about 84°F) and coldest in Apr (about 59°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 95 field readings (2010–2024) via the EPA Water Quality Portal. See the full Alpine Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 325 acres |
No bathymetric survey has been published for Alpine Lake, so its depth is not documented here.
Fishing Alpine Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.15 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.75 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.07 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Alpine Lake is a man-made reservoir impounded by the Alpine Lake Dam (completed 2000), built primarily for recreation on the CAVE CREEK; earth-type dam, 118 ft tall and 1,279 ft long.
- Surface area
- 325 ac
- Normal storage
- 10,266 ac-ft
- Max storage
- 14,260 ac-ft
- Drainage area
- 3.99 sq mi
- Hazard class
- High
- Owner
- INNSBROOK CORPORATION
Source: USACE National Inventory of Dams, NID ID MO32058 · Operator website
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Alpine Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Gateway Refrigerated WarehousesWarrenton · 3.4 mi away · NPDES MO0116459Recent violation
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.
County Ranking
Ranked #4 of 16 lakes in Warren County
Nearby Lakes in Warren County
Frequently asked questions about Alpine Lake
Where is Alpine Lake?
- Alpine Lake is a lake in Warren County, Missouri. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Alpine Lake?
- Alpine Lake in Warren County, Missouri has a water quality grade of A (Excellent). Water clarity: 12.6 ft visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Surface area: 325 acres.
Is Alpine Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Alpine Lake?
- Alpine Lake typically sits around 77°F at the surface in September, from 95 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Explore Alpine Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade A Lakes in Missouri
Oligotrophic Lakes in Missouri
Where this data comes from
116 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC116 samples · 2020–2024
Analytical methods
- Depth, Secchi disk in meters
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)