Huntington (Mammoth) Reservoir fishing
Huntington (Mammoth) Reservoir was last stocked on July 20, 2026 with 5,004 splake (3.0 in. average), according to the Utah DWR fish stocking report. It is a 120-acre reservoir in Sanpete County, Utah, listed by DWR as a Blue Ribbon Fishery. From 2021 to 2026, DWR stocked 103,396 fish here, the 3rd most of 71 stocked waters in Sanpete County.
Latest fishing report
Fall outlook: tiger trout and splake feed aggressively ahead of winter on streamers, mouse flies, spinners, Rapalas, marabou jigs and tubes, and trout cruise the shorelines more as water cools. Splake were added in 2021 to control illegally stocked redside shiners and Utah chub.
Our summary of the Utah DWR fishing report dated Sept. 4, 2026, in our own words. Read the original on DWR Fish Utah.
Huntington (Mammoth) Reservoir stocking report, last 12 months
| July 20, 2026 | Splake | 5,004 | 3.0 in. |
| May 12, 2026 | Tiger trout | 9,900 | 3.0 in. |
Source: Utah DWR fish stocking report. Stocking data fetched Sept. 25, 2026; newest record dated Sept. 23, 2026. DWR posts stockings after they happen and does not publish schedules.
When is Huntington (Mammoth) Reservoir stocked?
Based on DWR stocking records, 2021 to 2025. Stocked in 5 of those 5 years.
2025 stocking: 2 records, first on July 15, last on July 23.
DWR does not publish stocking schedules. Patterns are based on past stocking records and are not a promise of future stocking. Weather, water conditions and hatchery supply change plans. How we read patterns.
Huntington (Mammoth) Reservoir stocking profile
- First record in the DWR report: June 25, 2002. Since then DWR has logged 32 stockings here in 25 different years, 294,330 fish in all.
- Species stocked 2021 to 2026, by share of fish: tiger trout 58% (60,355 fish), splake 32% (33,051 fish) and wiper 10% (9,990 fish).
- Busiest months in the record: July (56% of records) and June (31% of records).
- Stocked fish averaged 3.6 in. from 2021 to 2026 (per-record averages ranged from 2.0 to 5.0 in.).
- Fish stocked 2021 to 2026: 103,396, the 3rd most of 71 stocked waters in Sanpete County and 59th of 1,068 statewide.
- Nearest other water with a page: Cleveland Reservoir, 1.8 mi away.
Computed from Utah DWR stocking records (fish counts and average lengths as DWR reports them). Past stocking is history, not a schedule.
Huntington (Mammoth) Reservoir stocking history by year
| Year | Records | Fish | Avg. length | Species |
|---|---|---|---|---|
| 2026 | 2 | 14,904 | 3.0 in. | Splake, Tiger trout |
| 2025 | 2 | 14,990 | 3.7 in. | Tiger trout, Splake |
| 2024 | 3 | 25,082 | 3.1 in. | Splake, Tiger trout, Wiper |
| 2023 | 2 | 20,158 | 4.2 in. | Splake, Tiger trout |
| 2022 | 2 | 13,668 | 4.6 in. | Splake, Tiger trout |
| 2021 | 2 | 14,594 | 3.4 in. | Tiger trout, Splake |
| 2020 | 1 | 9,975 | 3.7 in. | Tiger trout |
| 2019 | 1 | 10,140 | 3.6 in. | Tiger trout |
| 2018 | 1 | 10,000 | 3.9 in. | Tiger trout |
| 2017 | 1 | 9,995 | 4.1 in. | Tiger trout |
| 2016 | 1 | 10,080 | 3.8 in. | Tiger trout |
| 2015 | 1 | 9,999 | 5.1 in. | Tiger trout |
| 2014 | 1 | 10,120 | 4.8 in. | Tiger trout |
| 2013 | 1 | 10,000 | 3.9 in. | Tiger trout |
| 2012 | 1 | 10,080 | 4.5 in. | Tiger trout |
| 2011 | 1 | 10,230 | 3.5 in. | Tiger trout |
| 2010 | 1 | 10,044 | 3.5 in. | Tiger trout |
| 2009 | 1 | 10,010 | 3.3 in. | Tiger trout |
| 2008 | 1 | 10,000 | 3.8 in. | Tiger trout |
| 2007 | 1 | 10,011 | 3.4 in. | Tiger trout |
| 2006 | 1 | 10,000 | 3.8 in. | Tiger trout |
| 2005 | 1 | 10,000 | 3.8 in. | Tiger trout |
| 2004 | 1 | 10,100 | 3.1 in. | Tiger trout |
| 2003 | 1 | 10,125 | 3.4 in. | Tiger trout |
| 2002 | 1 | 10,025 | 3.3 in. | Tiger trout |
All stocking records 2021 to Sept. 24, 2025 (11)
| July 23, 2025 | Tiger trout | 9,990 | 3.8 in. |
| July 15, 2025 | Splake | 5,000 | 3.5 in. |
| Aug. 6, 2024 | Splake | 5,027 | 2.8 in. |
| July 30, 2024 | Tiger trout | 10,065 | 4.3 in. |
| July 17, 2024 | Wiper | 9,990 | 2.0 in. |
| July 18, 2023 | Splake | 9,918 | 4.0 in. |
| July 12, 2023 | Tiger trout | 10,240 | 4.5 in. |
| July 22, 2022 | Splake | 4,008 | 3.6 in. |
| July 19, 2022 | Tiger trout | 9,660 | 5.0 in. |
| June 21, 2021 | Tiger trout | 10,500 | 3.6 in. |
| June 1, 2021 | Splake | 4,094 | 2.9 in. |
Fishing rules
Sections: Near the top of Huntington Canyon.
- Cutthroat trout, and any trout with cutthroat markings, may not be kept.
Rules summarized in our own words from the 2026 Utah Fishing Guidebook. DWR can change rules mid-year: check the current guidebook and its updates at wildlife.utah.gov/guidebooks before fishing. See statewide limits.
Access and facilities
- Boating
- Boat ramp
- Other activities
- Cycling, Hiking, Wildlife watching
- Camping
- Primitive tent camping
- Accessible
- Restrooms
Facility list from DWR Fish Utah. Check with the land manager before you go; facilities close seasonally.
Email me when Huntington (Mammoth) Reservoir is stocked
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"Was stocked" alerts come from new rows in the DWR stocking report. "Often stocked around now" heads-ups come from past stocking records only. DWR does not publish stocking schedules, so a heads-up is never a promise. We store your email only for these alerts; ask us to delete it at [email protected]. Privacy.
Huntington (Mammoth) Reservoir questions
When is Huntington (Mammoth) Reservoir stocked?
DWR does not publish stocking schedules. Past records show Huntington (Mammoth) Reservoir was stocked in mid to late July (4 of the last 5 years). The most recent stocking in the DWR report is dated July 20, 2026.
What fish are in Huntington (Mammoth) Reservoir?
DWR lists splake and tiger trout as likely catches and cutthroat trout as possible. Since 2021 DWR has stocked splake, tiger trout and wiper.
Are there special fishing rules at Huntington (Mammoth) Reservoir?
Yes. The 2026 Utah Fishing Guidebook lists rules for this water, summarized on this page. Check the guidebook and DWR updates before fishing.
Stocking: Utah DWR fish stocking report, fetched Sept. 25, 2026. Size, program, species and facilities: DWR Fish Utah. Location: Utah DWR, USGS NHD. Rules: 2026 Utah Fishing Guidebook. Page built Sept. 24, 2026. Found an error? [email protected]. Verify rules with DWR before fishing.