Mantua Reservoir fishing
Mantua Reservoir was last stocked on Feb. 9, 2026 with 5,000 rainbow trout (9.8 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 135,973 fish here, the 2nd most of 16 stocked waters in Box Elder County.
Latest fishing report
Fall outlook: trout move shallow as it cools while bass and bluegill go deeper. Troll a pop gear with worm or small crankbaits at 10 to 15 feet, or fish dough bait or worms from shore. Largemouth hit spinnerbaits, tubes, grubs and crankbaits; bluegill take worms on size 8 or 10 hooks; perch hold along weed edges.
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
| Feb. 9, 2026 | Rainbow trout | 5,000 | 9.8 in. |
| Sept. 30, 2025 | Rainbow trout | 10,000 | 10.4 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 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. 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.
Mantua Reservoir stocking profile
- First record in the DWR report: April 5, 2002. Since then DWR has logged 182 stockings here in 25 different years, 1,224,511 fish in all.
- Species stocked 2021 to 2026, by share of fish: rainbow trout 64% (86,787 fish) and channel catfish 36% (49,186 fish).
- Busiest months in the record: October (26% of records) and September (19% of records).
- Stocked fish averaged 8.2 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: 135,973, the 2nd most of 16 stocked waters in Box Elder County and 46th of 1,068 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.
Mantua Reservoir stocking history by year
| Year | Records | Fish | Avg. length | Species |
|---|---|---|---|---|
| 2026 | 1 | 5,000 | 9.8 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 Sept. 24, 2025 (28)
| 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
The 2026 Utah Fishing Guidebook lists no water-specific rules for Mantua Reservoir under that name, so statewide rules apply unless DWR posts a change. Some waters are covered by a group entry (for example a drainage or its tributaries).
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
- Accessible
- Docks
- Facilities
- Restrooms
- Other activities
- Swimming
Facility list from DWR Fish Utah. Check with the land manager before you go; facilities close seasonally.
Email me when Mantua Reservoir is stocked
Email me when Mantua Reservoir shows up in the DWR stocking report. Alerts start once we switch on email; your choices are saved now.
"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.
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 Feb. 9, 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.
What are the fishing limits at Mantua Reservoir?
The 2026 guidebook lists no water-specific rules under this name, so statewide limits apply unless DWR posts a change. See our statewide limits page and check the guidebook.
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.