Silver Lake Flat Reservoir
Utah County, UtahView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Oligotrophic
- Impaired · Oxygen depletion (low DO)
- #1 of 19 in the county
- Limited data
Silver Lake Flat Reservoir in Utah County, Utah has a water quality grade of A (Excellent). Water clarity: 10.5 ft visibility. Phosphorus: 9.9 µg/L. Chlorophyll-a (algae): 1.1 µg/L.
- Clarity
- 10.5 ft
- Type
- Oligotrophic
- Phosphorus
- 9.9 µg/L
- Chlorophyll-a
- 1.1 µg/L
- Trend
- → Stable
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Watch Silver Lake Flat Reservoir’s letter
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Silver Lake Flat Reservoir is a cold, clear oligotrophic lake in Utah County, Utah. Water quality is graded A based on 2 sampling years through 2024. Water clarity is improving over recent sampling years. Compared to the 18 other monitored lakes in Utah County, Silver Lake Flat Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2024-09-19. Grade methodology: LakeQuality methodology.
What Silver Lake Flat Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Camping1 public campground nearby
Swimming Safety
Grade onlyLimited data
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. Silver Lake Flat Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 10.5 ft. Phosphorus 9.9 µg/L. Chlorophyll-a 1.1 µg/L. TSI 37. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | Not graded |
| Phosphorus | 9.9 µg/L | Good |
| Chlorophyll-a (Algae) | 1.1 µg/L | Good |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Recreation & Access
Public campgrounds near Silver Lake Flat Reservoir
- Holman Flat Dispersed Area1.6 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Fishing Silver Lake Flat Reservoir
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.15 m/yr | 3 |
| Chlorophyll-a | ↓ Declining | +0.17 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Silver Lake Flat Reservoir is a man-made reservoir impounded by the North Utah County - Silver Lake Flat (completed 1971), built primarily for water supply on the Silver Creek; earth-type dam, 84 ft tall and 1,500 ft long.
- Normal storage
- 1,040 ac-ft
- Max storage
- 1,384 ac-ft
- Drainage area
- 4 sq mi
- Hazard class
- High
- Owner
- North Utah County Water Conservancy Dist
Source: USACE National Inventory of Dams, NID ID UT00276 · Operator website · Matched by proximity (0.29 km)
EPA Impairment Status
Silver Lake Flat Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit UT-L-16020201-006_00 · Official waterbody report
County Ranking
Ranked #1 of 19 lakes in Utah County
Nearby Lakes in Utah County
Frequently asked questions about Silver Lake Flat Reservoir
Where is Silver Lake Flat Reservoir?
- Silver Lake Flat Reservoir is a lake in Utah County, Utah. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Silver Lake Flat Reservoir?
- Silver Lake Flat Reservoir in Utah County, Utah has a water quality grade of A (Excellent). Water clarity: 10.5 ft visibility. Phosphorus: 9.9 µg/L. Chlorophyll-a (algae): 1.1 µg/L.
Is Silver Lake Flat Reservoir safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Silver Lake Flat Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Are there campgrounds on Silver Lake Flat Reservoir?
- Silver Lake Flat Reservoir has 1 public campground from USGS The National Map within 5 km, including Holman Flat Dispersed Area. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Silver Lake Flat Reservoir across LakeQuality
3 thermal springs within 14.7 mi, nearest Crystal Hot Springs
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Where this data comes from
14 measurements from 1 monitoring station, 2012–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX14 samples · 2012–2024
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Impairment status from EPA ATTAINS 303(d) database
Public campgrounds from USGS The National Map Structures, within about 3 miles