Mantua Reservoir fishing
Mantua Reservoir was last stocked on Sept. 29, 2026 with 10,000 rainbow trout (9.6 in. average), according to the Utah DWR fish stocking report. It is a reservoir in Box Elder County, Utah. From 2021 to 2026, DWR stocked 145,973 fish here, the 2nd most of 16 stocked waters in Box Elder County.
Recent stockings at Mantua Reservoir
- Sept. 29, 202610,000 rainbow trout, 9.6 in. average
- Feb. 9, 20265,000 rainbow trout, 9.8 in. average
- Sept. 30, 202510,000 rainbow trout, 10.4 in. average
- March 18, 20255,000 rainbow trout, 9.8 in. average
- Oct. 28, 20243,246 rainbow trout, 10.2 in. average
- Oct. 22, 20241,304 rainbow trout, 10.6 in. average
Newest first, from the Utah DWR stocking report. Full stocking history.
Mantua Reservoir facts
- Last stocked
- Sept. 29, 2026 (42 days ago): 10,000 rainbow trout
- Stockings in 2026
- 2 (15,000 fish): 15,000 rainbow trout
- County
- Box Elder County
- Stocked since 2021
- rainbow trout and channel catfish
- Likely catch (DWR)
- bluegill, largemouth bass, rainbow trout and yellow perch
- Average size stocked
- 8.3 in. (2021 to 2026)
- County rank
- 2nd most fish of 16 stocked waters in Box Elder County since 2021
- Name in DWR report
- MANTUA RES
- Nearest water
- Mayors Pond, 3.4 mi
- Rules
- Statewide rules (no water-specific entry in the 2026 guidebook)
Latest fishing report
Fall outlook: as the water cools, trout begin to move into shallower water while warmwater species like largemouth bass and bluegill move deeper. From shore, try a worm or trout dough bait on the bottom in the shallows; boaters can do well by trolling pop gear with a worm, or small crankbaits, in 10 to 15 feet of water. Largemouth bass feed mainly on yellow perch and young bluegill, so try casting spinnerbaits, twist tail grubs, tube jigs or crankbaits straight out from shore. For bluegill and other sunfish, try a worm beneath a bobber on a No. 8 or No. 10 hook, near submerged brush or water plants. For yellow perch, work the outer edges of weedy areas with a worm dropped to the bottom or hung beneath a bobber.
Our summary of the Utah DWR fishing report dated Sept. 17, 2026, in our own words. Read the original on DWR Fish Utah.
Mantua Reservoir stocking report, last 12 months
| Sept. 29, 2026 | Rainbow trout | 10,000 | 9.6 in. |
| Feb. 9, 2026 | Rainbow trout | 5,000 | 9.8 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.
Mantua Reservoir stocking profile
- First record in the DWR report: April 5, 2002. Since then DWR has logged 183 stockings here in 25 different years, 1,234,511 fish in all.
- Species stocked 2021 to 2026, by share of fish: rainbow trout 66% (96,787 fish) and channel catfish 34% (49,186 fish).
- Busiest months in the record: October (26% of records) and September (20% of records).
- Stocked fish averaged 8.3 in. from 2021 to 2026 (per-record averages ranged from 3.1 to 18.4 in.). The yearly average was 6.9 in. in 2021 and 10.2 in. in 2025.
- Fish stocked 2021 to 2026: 145,973, the 2nd most of 16 stocked waters in Box Elder County and 43rd of 1,076 statewide.
- Nearest other water with a page: Mayors Pond, 3.4 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 Mantua Reservoir stocked?
Based on DWR stocking records, 2021 to 2025. Stocked in 5 of those 5 years.
2025 stocking: 2 records, first on March 18, last on Sept. 30.
DWR does not publish stocking schedules. This is past stocking, not a promise. How we read patterns.
Mantua Reservoir stocking history by year
| Year | Records | Fish | Avg. length | Species |
|---|---|---|---|---|
| 2026 | 2 | 15,000 | 9.7 in. | Rainbow trout |
| 2025 | 2 | 15,000 | 10.2 in. | Rainbow trout |
| 2024 | 6 | 15,008 | 11.1 in. | Rainbow trout |
| 2023 | 4 | 15,202 | 10.5 in. | Rainbow trout |
| 2022 | 9 | 44,073 | 6.9 in. | Rainbow trout, Channel catfish |
| 2021 | 8 | 41,690 | 6.9 in. | Rainbow trout, Channel catfish |
| 2020 | 9 | 47,683 | 6.8 in. | Rainbow trout, Tiger trout, Channel catfish |
| 2019 | 5 | 49,747 | 6.2 in. | Channel catfish, Rainbow trout |
| 2018 | 9 | 138,513 | 3.0 in. | Rainbow trout, Channel catfish |
| 2017 | 3 | 12,331 | 10.5 in. | Rainbow trout |
| 2016 | 4 | 41,848 | 7.2 in. | Cutthroat trout, Rainbow trout |
| 2015 | 6 | 24,102 | 8.5 in. | Rainbow trout, Largemouth bass |
| 2014 | 8 | 20,714 | 10.8 in. | Rainbow trout |
| 2013 | 13 | 43,700 | 8.3 in. | Rainbow trout, Tiger trout |
| 2012 | 3 | 48,587 | 7.0 in. | Tiger trout, Rainbow trout |
| 2011 | 6 | 41,664 | 8.0 in. | Tiger trout, Rainbow trout, Cutthroat trout |
| 2010 | 4 | 20,492 | 9.9 in. | Rainbow trout |
| 2009 | 5 | 7,715 | 10.1 in. | Rainbow trout |
| 2008 | 8 | 43,633 | 7.8 in. | Tiger trout, Rainbow trout |
| 2007 | 9 | 72,136 | 4.7 in. | Rainbow trout, Cutthroat trout |
| 2006 | 9 | 58,307 | 4.9 in. | Rainbow trout, Cutthroat trout |
| 2005 | 11 | 96,264 | 4.7 in. | Cutthroat trout, Rainbow trout |
| 2004 | 10 | 94,581 | 4.6 in. | Cutthroat trout, Rainbow trout |
| 2003 | 14 | 107,702 | 4.7 in. | Rainbow trout, Cutthroat trout |
| 2002 | 16 | 118,819 | 4.3 in. | Rainbow trout, Cutthroat trout, Minnow |
All stocking records 2021 to Nov. 10, 2025 (29)
| Sept. 30, 2025 | Rainbow trout | 10,000 | 10.4 in. |
| March 18, 2025 | Rainbow trout | 5,000 | 9.8 in. |
| Oct. 28, 2024 | Rainbow trout | 3,246 | 10.2 in. |
| Oct. 22, 2024 | Rainbow trout | 1,304 | 10.6 in. |
| Oct. 18, 2024 | Rainbow trout | 250 | 10.6 in. |
| Sept. 16, 2024 | Rainbow trout | 2,520 | 10.0 in. |
| Sept. 12, 2024 | Rainbow trout | 2,688 | 12.5 in. |
| April 16, 2024 | Rainbow trout | 5,000 | 11.6 in. |
| Oct. 3, 2023 | Rainbow trout | 531 | 10.0 in. |
| Sept. 25, 2023 | Rainbow trout | 4,024 | 10.0 in. |
| Sept. 25, 2023 | Rainbow trout | 5,487 | 10.0 in. |
| May 3, 2023 | Rainbow trout | 5,160 | 11.3 in. |
| Oct. 4, 2022 | Rainbow trout | 1,225 | 10.4 in. |
| Sept. 28, 2022 | Rainbow trout | 4,585 | 12.1 in. |
| Sept. 28, 2022 | Rainbow trout | 5,600 | 12.1 in. |
| Sept. 27, 2022 | Rainbow trout | 1,224 | 11.6 in. |
| Sept. 27, 2022 | Rainbow trout | 2,449 | 11.6 in. |
| Sept. 15, 2022 | Channel catfish | 3,280 | 3.1 in. |
| Sept. 14, 2022 | Channel catfish | 20,008 | 3.1 in. |
| June 2, 2022 | Channel catfish | 702 | 11.7 in. |
| April 19, 2022 | Rainbow trout | 5,000 | 9.3 in. |
| Nov. 9, 2021 | Rainbow trout | 810 | 11.2 in. |
| Nov. 9, 2021 | Rainbow trout | 1,080 | 11.2 in. |
| Sept. 27, 2021 | Rainbow trout | 9,604 | 10.2 in. |
| Sept. 15, 2021 | Channel catfish | 12,205 | 4.0 in. |
| Sept. 15, 2021 | Channel catfish | 11,160 | 4.2 in. |
| June 24, 2021 | Channel catfish | 831 | 18.4 in. |
| June 24, 2021 | Channel catfish | 1,000 | 13.6 in. |
| March 29, 2021 | Rainbow trout | 5,000 | 8.7 in. |
Fishing rules
No water-specific entry for Mantua Reservoir in the 2026 guidebook: statewide limits apply unless a group entry (such as a drainage) covers it.
From the 2026 Utah Fishing Guidebook, in our own words. Rules can change mid-year: check wildlife.utah.gov/guidebooks before fishing.
Access and facilities
- Boating
- Boat ramp
- Accessible
- Docks
- Facilities
- Restrooms
- Other activities
- Swimming
Facility list from DWR Fish Utah. Check with the land manager before you go; facilities close seasonally.
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Mantua Reservoir questions
When is Mantua Reservoir stocked?
DWR does not publish stocking schedules. Past records show Mantua Reservoir was stocked in mid to late September (5 of the last 5 years) and early to mid October (3 of the last 5 years). The most recent stocking in the DWR report is dated Sept. 29, 2026.
What fish are in Mantua Reservoir?
DWR lists bluegill, largemouth bass, rainbow trout and yellow perch as likely catches and green sunfish and smallmouth bass as possible. Since 2021 DWR has stocked rainbow trout and channel catfish.
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.