reservoir

Grassy Lake Reservoir — Wasatch Plateau

Sanpete County · Central region

Fairconditions
55°todaySunny

Today’s report

Grassy Lake Reservoir — Wasatch Plateau is a fair bet today. The DWR last stocked rainbow trout (513 fish) on August 3. Today's forecast: sunny, 55°F.

Current conditions

Stocking

Last stocked Aug 3, 2026 — rainbow trout (513 fish).

DateSpeciesQuantityAvg length
Aug 3, 2026rainbow trout51310.68"
Jul 20, 2026rainbow trout49910.28"
Jul 8, 2026rainbow trout50010.77"
Jun 16, 2026rainbow trout9949.63"
May 12, 2026tiger trout (brown × brook hybrid)2,8602.96"
Jul 17, 2025rainbow trout87211.07"
Jul 17, 2025rainbow trout62211.07"
Jun 10, 2025tiger trout (brown × brook hybrid)2,5302.96"

Best time to fish Grassy Lake Reservoir — Wasatch Plateau

The DWR has stocked Grassy Lake Reservoir — Wasatch Plateau 25 times over the last 6 seasons, and 88% of those plants landed in May through July — the freshest fish and the easiest bite usually follow within a week or two of a stocking.

Species

rainbow trouttiger trout (brown × brook hybrid)

Location

39.32210, -111.33140 · Sanpete County · 17 mi from Manti

Nearby waters (within ~25 mi):

Academy Mill Reservoir — Wasatch PlateauSanpete CountyFairSoup Bowl Reservoir — Wasatch PlateauSanpete CountyFairJoes Valley ReservoirEmery CountyFairMarys Lake — Wasatch PlateauSanpete CountyFairNew Canyon Reservoir — Wasatch PlateauSanpete CountyFairSnow Lake — Wasatch PlateauSanpete CountyFairCove Lake — Wasatch PlateauSanpete CountyFairPotters No 1 — Wasatch PlateauEmery CountyFair

Regulations

No water-specific rules listed for this water in the current Utah Fishing Guidebook — statewide general rules and daily limits apply (trout limit 4, combined). Verify in the current guidebook before you fish.

This week’s weather

Today
55°F
Sunny
Tonight
37°F
Partly Cloudy
Sunday
52°F
Partly Sunny
Sunday Night
38°F
Mostly Cloudy
Monday
51°F
Mostly Sunny then Slight Chance Light Rain
19% precip
Monday Night
40°F
Slight Chance Light Rain then Partly Cloudy
17% precip
Tuesday
48°F
Chance Light Rain then Showers And Thunderstorms Likely
71% precip
Tuesday Night
40°F
Chance Showers And Thunderstorms then Chance Light Rain
34% precip
Wednesday
49°F
Chance Light Rain then Showers And Thunderstorms Likely
56% precip
Wednesday Night
41°F
Showers And Thunderstorms then Light Rain
81% precip