Sederlin Lake
Carbon County, Wyoming40 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Sederlin Lake in Carbon County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 50 µg/L. Surface area: 40 acres.
- Area
- 40 acres
- Phosphorus
- 50 µg/L
- Trend
- ↓ Declining
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Watch Sederlin Lake’s letter
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Why Sederlin Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Sederlin Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Wyoming DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Sederlin Lake is a 40-acre lake in Carbon County, Wyoming. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2014-09-09. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Sederlin Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 50 µg/L. TSI 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 50 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 40 acres |
No bathymetric survey has been published for Sederlin Lake, so its depth is not documented here.
Fishing Sederlin Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +20 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Sederlin Lake is a man-made reservoir impounded by the Sederlin (completed 1910), built primarily for irrigation on the Fish Creek; earth-type dam, 7 ft tall and 510 ft long.
- Surface area
- 40 ac
- Normal storage
- 120 ac-ft
- Max storage
- 173 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- Low
- Owner
- DOUBLE 8 LAND CORPORATION
All listed purposes: Irrigation;Fish and Wildlife Pond.
Source: USACE National Inventory of Dams, NID ID WY00388 · Operator website
Graded lakes near Sederlin Lake
Sederlin Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Carbon County
Frequently asked questions about Sederlin Lake
Where is Sederlin Lake?
- Sederlin Lake is a lake in Carbon County, Wyoming. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Sederlin Lake?
- Sederlin Lake in Carbon County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 50 µg/L. Surface area: 40 acres.
Is Sederlin Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
5 measurements from 1 monitoring station, 2013–2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- State of Wyoming Department of Environmental Quality Watershed Program
WYDEQ_WATERSHED5 samples · 2013–2014
Analytical methods
- Total Phosphorus After Block Digestion
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.