Mantua Reservoir Fish Stocking
BOX ELDER County, Utah · 1980–2026 on record
According to Utah DWR — Fish Stocking Report, Mantua Reservoir was last stocked February 9, 2026 with Rainbow Trout. Mantua Reservoir has 350 stocking records on file, spanning 1980–2026, with about 2,616,011 fish stocked over that period.
When Mantua Reservoir is stocked
Mantua Reservoir is typically stocked in fall, most often in October — 99 stocking events in that peak month.
By species
Angler's Field Guide
Fishing Tips & Stocking Guide for Mantua Reservoir
Practical advice on fish behavior, recommended tackle, and state regulations for anglers fishing in BOX ELDER County, Utah.
Post-Plant Behavior & Timing
Hatchery-raised fish are conditioned to pelleted feed and open raceways. Following a release into Mantua Reservoir, they typically congregate in schools near public access points, boat ramps, or inlets for the first 24 to 48 hours while adjusting to natural water conditions.
Since Mantua Reservoir was last stocked February 9, 2026, anglers visiting within 1 to 2 weeks of a reported event generally experience the highest activity before fish disperse into deeper cover.
State Regulations & Licensing
- •Fishing License: A valid Utah freshwater fishing license is required for anglers age 16 and older.Purchase Utah license online →
- •Official Rules & Limits: Bag limits, bait restrictions, and seasonal boundaries are set by Utah fish & wildlife agency.Official Utah regulations guidebook →
- •Ethical Conservation: Use barbless hooks and keep fish submerged in water during unhooking.Trout Thermal Advisory: When water temperatures rise above 68°F (20°C), released trout face severe mortality from thermal exhaustion. Target warmwater species or fish early in the morning when lakes and streams warm up.
Recommended Tackle & Presentations
Techniques tailored to the species stocked in Mantua Reservoir:
Stocked Trout Tactics
Use light 4–6 lb monofilament or fluorocarbon line. Float scented dough bait (PowerBait) 12–18" off bottom using a sliding slip-sinker rig with a size 14–16 treble hook. For active casting, throw 1/16 to 1/8 oz inline spinners (Panther Martin, Rooster Tail) or small spoons (Kastmaster) along drop-offs.
Catfish Rigging
Fish a Carolina slip-sinker bottom rig with a 1/2 to 1 oz egg sinker, swivel, and 1/0–3/0 circle hook. Baits such as chicken liver, cut baitfish (shad), nightcrawlers, and stink baits produce best during early morning, dusk, or night in deeper holes.
Bass & Panfish Approach
Target visible structure such as docks, weed lines, and fallen trees. Small 1/32 to 1/16 oz jig heads with soft plastic grubs or live worms under a float work well for crappie and bluegill; soft plastic worms or spinnerbaits work well for bass.
Rainbow Trout Profile Tips
The most commonly targeted stocked trout in the country, taken on bait, spinners, and flies alike; a common first fish for new anglers.
Channel Catfish Profile Tips
Popular with bait anglers using cut bait, worms, or prepared 'stink bait'; often stocked specifically for summer evening fishing.
Recommended Tackle for Mantua Reservoir
Field-tested tackle and presentations matched to the species stocked here.
Berkley PowerBait Floating Trout Dough
Hatchery-raised trout are conditioned to pelleted scents; scented dough floated 12–18 inches off bottom consistently triggers strikes.
Panther Martin Classic Teardrop Inline Spinner
The heavy convex blade spins instantly upon retrieval, sending vibration through the water that triggers aggressive reaction bites along drop-offs.
Sliding Sinker & Treble Hook Rigging Kit
Sliding egg sinkers allow cautious trout to run with bait without feeling line drag, while size 14–16 treble hooks keep dough bait securely pinned.
Heavy Duty Offset Circle Hooks (1/0–3/0)
Circle hooks naturally turn into the corner of a catfish's jaw as it turns, preventing gut-hooking and improving hookup rates.
As an Amazon Associate, StockedWaters earns from qualifying purchases at no additional cost to you. Recommendations are chosen for hatchery-conditioned fish behavior and ethical rigging. We may receive a referral commission if you buy through these links. Read our editorial policy & standards.
Nearby stocked waters
Other stocked waters near Mantua Reservoir, freshest activity first.
Porcupine Reservoir
10 miCACHE County · 8 species · 146 records
Last stocked June 2026
Cold Spring Lakes
12 miBOX ELDER County · 1 species · 184 records
Last stocked June 2026
Pioneer Park P
5 miBOX ELDER County · 10 species · 349 records
Last stocked June 2026
Wellsville Reservoir
9 miCACHE County · 8 species · 359 records
Last stocked June 2026
Hyrum Reservoir
9 miCACHE County · 12 species · 682 records
Last stocked May 2026
Mayor's Pond
3 miBOX ELDER County · 5 species · 182 records
Last stocked April 2026
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| February 9, 2026 | Rainbow Trout | 5,000 | 9.82" | Utah DWR |
| September 30, 2025 | Rainbow Trout | 10,000 | 10.4" | Utah DWR |
| March 18, 2025 | Rainbow Trout | 5,000 | 9.82" | Utah DWR |
| October 28, 2024 | Rainbow Trout | 3,246 | 10.17" | Utah DWR |
| October 22, 2024 | Rainbow Trout | 1,304 | 10.55" | Utah DWR |
| October 18, 2024 | Rainbow Trout | 250 | 10.55" | Utah DWR |
| September 16, 2024 | Rainbow Trout | 2,520 | 9.97" | Utah DWR |
| September 12, 2024 | Rainbow Trout | 2,688 | 12.5" | Utah DWR |
Show 42 more stocking records →
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| April 16, 2024 | Rainbow Trout | 5,000 | 11.58" | Utah DWR |
| October 3, 2023 | Rainbow Trout | 531 | 10.04" | Utah DWR |
| September 25, 2023 | Rainbow Trout | 4,024 | 10.04" | Utah DWR |
| September 25, 2023 | Rainbow Trout | 5,487 | 10.04" | Utah DWR |
| May 3, 2023 | Rainbow Trout | 5,160 | 11.33" | Utah DWR |
| October 4, 2022 | Rainbow Trout | 1,225 | 10.36" | Utah DWR |
| September 28, 2022 | Rainbow Trout | 4,585 | 12.13" | Utah DWR |
| September 28, 2022 | Rainbow Trout | 5,600 | 12.13" | Utah DWR |
| September 27, 2022 | Rainbow Trout | 1,224 | 11.59" | Utah DWR |
| September 27, 2022 | Rainbow Trout | 2,449 | 11.59" | Utah DWR |
| September 15, 2022 | Channel Catfish | 3,280 | 3.12" | Utah DWR |
| September 14, 2022 | Channel Catfish | 20,008 | 3.12" | Utah DWR |
| June 2, 2022 | Channel Catfish | 702 | 11.7" | Utah DWR |
| April 19, 2022 | Rainbow Trout | 5,000 | 9.25" | Utah DWR |
| November 9, 2021 | Rainbow Trout | 1,080 | 11.16" | Utah DWR |
| November 9, 2021 | Rainbow Trout | 810 | 11.16" | Utah DWR |
| September 27, 2021 | Rainbow Trout | 9,604 | 10.16" | Utah DWR |
| September 15, 2021 | Channel Catfish | 11,160 | 4.15" | Utah DWR |
| September 15, 2021 | Channel Catfish | 12,205 | 3.97" | Utah DWR |
| June 24, 2021 | Channel Catfish | 1,000 | 13.57" | Utah DWR |
| June 24, 2021 | Channel Catfish | 831 | 18.42" | Utah DWR |
| March 29, 2021 | Rainbow Trout | 5,000 | 8.67" | Utah DWR |
| November 25, 2020 | Rainbow Trout | 1,172 | 8.27" | Utah DWR |
| October 6, 2020 | Rainbow Trout | 2,100 | 9.69" | Utah DWR |
| October 6, 2020 | Rainbow Trout | 12,727 | 10.23" | Utah DWR |
| October 6, 2020 | Rainbow Trout | 2,100 | 10.39" | Utah DWR |
| September 30, 2020 | Tiger Trout | 1,188 | 9.12" | Utah DWR |
| September 17, 2020 | Rainbow Trout | 3,295 | 10.74" | Utah DWR |
| September 15, 2020 | Channel Catfish | 18,601 | 2.48" | Utah DWR |
| March 17, 2020 | Rainbow Trout | 3,250 | 7.83" | Utah DWR |
| March 17, 2020 | Rainbow Trout | 3,250 | 7.83" | Utah DWR |
| October 31, 2019 | Channel Catfish | 8,910 | 4.35" | Utah DWR |
| October 7, 2019 | Rainbow Trout | 15,332 | 10.12" | Utah DWR |
| September 30, 2019 | Channel Catfish | 2,254 | 3.12" | Utah DWR |
| September 11, 2019 | Channel Catfish | 17,748 | 3.26" | Utah DWR |
| April 4, 2019 | Rainbow Trout | 5,503 | 8.7" | Utah DWR |
| November 17, 2018 | Rainbow Trout | 9,266 | 13.03" | Utah DWR |
| October 16, 2018 | Channel Catfish | 18,912 | 4.38" | Utah DWR |
| October 3, 2018 | Rainbow Trout | 2,000 | 8.48" | Utah DWR |
| September 11, 2018 | Channel Catfish | 20,000 | 3.59" | Utah DWR |
| September 5, 2018 | Channel Catfish | 161 | 29.99" | Utah DWR |
| September 5, 2018 | Channel Catfish | 160 | 29.99" | Utah DWR |
Showing 50 of 350 stocking records.
Frequently asked
When was Mantua Reservoir last stocked?
According to Utah DWR — Fish Stocking Report, Mantua Reservoir was last stocked February 9, 2026 with Rainbow Trout.
What fish species are stocked in Mantua Reservoir?
Mantua Reservoir is stocked with Rainbow Trout, Channel Catfish, Tiger Trout, Cutthroat Trout, Largemouth Bass, Fathead Minnow, Bluegill, and Utah Chub.
What time of year is Mantua Reservoir stocked?
Mantua Reservoir is typically stocked in fall, most often in October.
How often is Mantua Reservoir stocked?
Mantua Reservoir has been stocked about 7 times a year — 350 recorded stockings between 1980 and 2026.
How many fish have been stocked in Mantua Reservoir?
About 2,616,011 fish have been stocked in Mantua Reservoir across 350 recorded events since 1980, per Utah fish & wildlife agency.
What size are the fish stocked in Mantua Reservoir?
Fish stocked in Mantua Reservoir average about 8.7 inches, based on the sizes the agency reported.
Do you need a fishing license to fish Mantua Reservoir?
Yes, all anglers age 16 and older generally need a valid Utah freshwater fishing license. Always review current regulations from Utah fish & wildlife agency for site-specific rules, bag limits, or stamps.
How do you catch stocked trout in Mantua Reservoir?
Freshly stocked trout in Mantua Reservoir typically respond well to floating dough bait (such as PowerBait) floated 12–18 inches off bottom on light 4–6 lb leader, live nightcrawlers under a bobber, and small inline spinners or spoons retrieved along shorelines and drop-offs.