Mortenson Lake D
Albany County, Wyoming71 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.
- 15 ft max depth
- Limited data
Mortenson Lake D in Albany County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 20 µg/L. Surface area: 71 acres.
- Max depth
- ~15 ft est.
- Area
- 71 acres
- Phosphorus
- 20 µg/L
- Trend
- ↓ Declining
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Watch Mortenson Lake D’s letter
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Why Mortenson Lake D 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 Mortenson Lake D, 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.
Mortenson Lake D is a 71-acre lake in Albany County, Wyoming with an estimated average depth of about 15 feet. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2014-09-17. 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 Mortenson Lake D
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 20 µg/L. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 20 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~15 ft est. |
| Average Depth | ~8 ft est. |
| Surface Area | 71 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wyoming has not published bathymetry for Mortenson Lake D.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Mortenson Lake D
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +10 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Mortenson Lake D is a man-made reservoir impounded by the Seepage Lake (completed 1970), built primarily for irrigation on the Meeboer Or Soda Lake Draw; earth-type dam, 7 ft tall and 1,600 ft long.
- Surface area
- 71 ac
- Normal storage
- 248 ac-ft
- Max storage
- 603 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- Low
- Owner
- US FISH & WLDLIFE SERVICE -ARAPAHO NATL WILDLIFE REFUGE
Source: USACE National Inventory of Dams, NID ID WY01853 · Operator website · Matched by proximity (0.19 km)
Graded lakes near Mortenson Lake D
Mortenson Lake D has no grade, but these lakes within a short drive do.
Nearby Lakes in Albany County
Frequently asked questions about Mortenson Lake D
Where is Mortenson Lake D?
- Mortenson Lake D is a lake in Albany 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 Mortenson Lake D?
- Mortenson Lake D in Albany County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 20 µg/L. Surface area: 71 acres.
Is Mortenson Lake D safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Mortenson Lake D?
- No published bathymetric survey covers Mortenson Lake D, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 15 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 71 acres.
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Where this data comes from
3 measurements from 1 monitoring station, 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_WATERSHED3 samples · 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.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)