Tibble Fork Reservoir
Utah County, UtahView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Mesotrophic
- Impaired · Oxygen depletion (low DO)
- #3 of 19 in the county
- Limited data
Tibble Fork Reservoir in Utah County, Utah has a water quality grade of C (Fair). Water clarity: 5.2 ft visibility. Phosphorus: 23.6 µg/L. Chlorophyll-a (algae): 3.5 µg/L.
- Clarity
- 5.2 ft
- Type
- Mesotrophic
- Phosphorus
- 23.6 µg/L
- Chlorophyll-a
- 3.5 µg/L
- Trend
- ↓ Declining
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Watch Tibble Fork Reservoir’s letter
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Tibble Fork Reservoir is a mesotrophic lake in Utah County, Utah. Water quality is graded C based on 1 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 18 other monitored lakes in Utah County, Tibble Fork Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2024-09-19. Grade methodology: LakeQuality methodology.
What Tibble Fork Reservoir is good for
From access and monitoring records, not editorial picks.
- Camping3 public campgrounds 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 C is nutrients and algae, not a swimming clearance. Tibble Fork 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: C (Fair)
Murky, only visible to about 5.2 ft. Phosphorus 23.6 µg/L. Chlorophyll-a 3.5 µg/L. TSI 49. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | Not graded |
| Phosphorus | 23.6 µg/L | Not graded |
| Chlorophyll-a (Algae) | 3.5 µg/L | Fair |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Recreation & Access
Public campgrounds near Tibble Fork Reservoir
- Granite Flat1.1 km
- Little Mill4.4 km
- Salamander Dispersed Area5.0 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 Tibble Fork Reservoir
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.03 m/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.32 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Tibble Fork Reservoir is a man-made reservoir impounded by the North Utah County - Tibble Fork (completed 1966), built primarily for irrigation on the No Fk of American Fork River; earth-type dam, 50 ft tall and 520 ft long.
- Normal storage
- 380 ac-ft
- Max storage
- 610 ac-ft
- Drainage area
- 35 sq mi
- Hazard class
- High
- Owner
- NORTH UTAH COUNTY WATER CONSERVANCY DIST
Source: USACE National Inventory of Dams, NID ID UT00299 · Operator website · Matched by proximity (0.25 km)
EPA Impairment Status
Tibble Fork 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 · Matched by proximity (2.6 km)
County Ranking
Ranked #3 of 19 lakes in Utah County
Nearby Lakes in Utah County
Frequently asked questions about Tibble Fork Reservoir
Where is Tibble Fork Reservoir?
- Tibble Fork Reservoir is a lake in Utah County, Utah. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Tibble Fork Reservoir?
- Tibble Fork Reservoir in Utah County, Utah has a water quality grade of C (Fair). Water clarity: 5.2 ft visibility. Phosphorus: 23.6 µg/L. Chlorophyll-a (algae): 3.5 µg/L.
Is Tibble Fork Reservoir safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Tibble Fork 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 Tibble Fork Reservoir?
- Tibble Fork Reservoir has 3 public campgrounds from USGS The National Map within 5 km, including Granite Flat, Little Mill, Salamander 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 Tibble Fork Reservoir across LakeQuality
3 thermal springs within 15.4 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
Moderate nutrients, good water quality
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Other Grade C Lakes in Utah
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Where this data comes from
66 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_WQX66 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