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.
Recent stockings at Huntington (Mammoth) Reservoir
- July 20, 20265,004 splake, 3.0 in. average
- May 12, 20269,900 tiger trout, 3.0 in. average
- July 23, 20259,990 tiger trout, 3.8 in. average
- July 15, 20255,000 splake, 3.5 in. average
- Aug. 6, 20245,027 splake, 2.8 in. average
- July 30, 202410,065 tiger trout, 4.3 in. average
Newest first, from the Utah DWR stocking report. Full stocking history.
Huntington (Mammoth) Reservoir facts
- Last stocked
- July 20, 2026 (113 days ago): 5,004 splake
- Stockings in 2026
- 2 (14,904 fish): 9,900 tiger trout and 5,004 splake
- County
- Sanpete County
- Size
- 120 acres
- DWR program
- Blue Ribbon Fishery
- Stocked since 2021
- splake, tiger trout and wiper
- Likely catch (DWR)
- splake and tiger trout
- Average size stocked
- 3.6 in. (2021 to 2026)
- County rank
- 3rd most fish of 71 stocked waters in Sanpete County since 2021
- Name in DWR report
- HUNTINGTON RES
- Nearest water
- Cleveland Reservoir, 1.8 mi
- Rules
- Water-specific rules in the 2026 guidebook
Latest fishing report
Fall outlook: tiger trout and splake turn aggressive ahead of winter and can be caught on streamer and mouse-pattern flies, spinners and Rapalas, or marabou and tube jigs. Along the shorelines, trout should be more active as the water cools. The 2021 introduction of splake was meant to help control the illegally introduced redside shiners and Utah chub.
This report is more than 60 days old. Conditions have likely changed.
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 Nov. 10, 2026; newest record dated Nov. 19, 2026. DWR posts stockings after they happen and does not publish schedules.
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 61st of 1,076 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.
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. This is past stocking, not a promise. How we read patterns.
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 Nov. 10, 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.
From the 2026 Utah Fishing Guidebook, in our own words. Rules can change mid-year: check 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.
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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 Nov. 10, 2026. Size, program, species and facilities: DWR Fish Utah. Location: Utah DWR, USGS NHD. Rules: 2026 Utah Fishing Guidebook. Page built Nov. 10, 2026. Found an error? Tell us. Verify rules with DWR before fishing.