Seetal Lake
Gasconade County, Missouri14 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↑ up from B at the last regrade
- Mesotrophic
- #1 of 3 in the county
- Public access
Seetal Lake in Gasconade County, Missouri has a water quality grade of A (Excellent). Water clarity: 7.2 ft visibility. Phosphorus: 17 µg/L. Chlorophyll-a (algae): 5.9 µg/L. Surface area: 14 acres.
- Clarity
- 7.2 ft
- Typical in September
- 79°F
- Area
- 14 acres
- Type
- Mesotrophic
- Phosphorus
- 17 µg/L
- Chlorophyll-a
- 5.9 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
Stays via Stay22
Stays near Seetal Lake
Compare lakeside cabins, hotels, and vacation rentals near Seetal Lake in Gasconade 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 Seetal Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
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 whole trip? See where to stay at Missouri’s top lakes →
Watch Seetal Lake’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Seetal Lake is a 14-acre mesotrophic lake in Gasconade County, Missouri. Water quality is graded A based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 2 other monitored lakes in Gasconade County, Seetal Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-11. 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 A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Moderate clarity, visible to about 7.2 ft. Phosphorus 17 µg/L. Chlorophyll-a 5.9 µg/L. TSI 47. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.2 ft | Not graded |
| Phosphorus | 17 µg/L | Good |
| Chlorophyll-a (Algae) | 5.9 µg/L | Good |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Seetal Lake typically sits around 79°F at the surface in September. Summer average is about 83°F. Usually warmest in Jul (about 85°F) and coldest in Apr (about 64°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 15 field readings (2020–2024) via the EPA Water Quality Portal. See the full Seetal Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 14 acres |
| Public Access | Yes |
No bathymetric survey has been published for Seetal Lake, so its depth is not documented here.
Fishing Seetal Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.041 m/yr | 4 |
| Phosphorus | ↑ Improving | -1.76 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -1.3 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Seetal Lake is a man-made reservoir impounded by the See Tal Lake Dam (completed 1971), built primarily for recreation on the TR-FRENE CREEK; earth-type dam, 51 ft tall and 600 ft long.
- Surface area
- 14 ac
- Normal storage
- 158 ac-ft
- Max storage
- 232 ac-ft
- Drainage area
- 0.27 sq mi
- Hazard class
- High
- Owner
- SEE TAL PROPERTY OWNERS
Source: USACE National Inventory of Dams, NID ID MO30668 · Operator website
Regulated Pollution Sources Nearby
6 EPA-permitted facilities operate within about 5 miles of Seetal Lake under Clean Water Act (NPDES) discharge permits. 5 facilities have a reported Clean Water Act violation in the past three years.
- Hermann WwtfHermann · 1.5 mi away · NPDES MO0106585Recent violation
- Mckittrick BpMckittrick · 1.7 mi away · NPDES MO0138134Recent violation
- Hermann Industrial Tract LagoonHermann · 2.1 mi away · NPDES MO0116009Recent violation
- Bruche And Nachas WwtfBerger · 3.9 mi away · NPDES MO0103691Recent violation
- Rhineland WwtfRhineland · 4.8 mi away · NPDES MO0117013Recent violation
- Spg Laser Light Technologies LlcHermann · 1.9 mi away · NPDES MONX00938
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 #1 of 3 lakes in Gasconade County
Nearby Lakes in Gasconade County
Frequently asked questions about Seetal Lake
Where is Seetal Lake?
- Seetal Lake is a lake in Gasconade County, Missouri. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Seetal Lake?
- Seetal Lake in Gasconade County, Missouri has a water quality grade of A (Excellent). Water clarity: 7.2 ft visibility. Phosphorus: 17 µg/L. Chlorophyll-a (algae): 5.9 µg/L. Surface area: 14 acres.
Is Seetal 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 Seetal Lake?
- Seetal Lake typically sits around 79°F at the surface in September, from 15 EPA Water Quality Portal field readings (2020–2024). That is a typical value for the month, not a live reading.
Explore Seetal Lake across LakeQuality
More Missouri Lake Rankings
Other Grade A Lakes in Missouri
Mesotrophic Lakes in Missouri
Where this data comes from
45 measurements from 2 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC42 samples · 2022–2024 - Missouri Dept. of Natural Resources
MDNR3 samples · 2020
Analytical methods
- Depth, Secchi disk in meters
- Nitrogen and Phosphorus, Total, Whole-water, Alkaline Persulfate Digest
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
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)