Onstadt Res Fish Stocking
Montana · 1997–1997 on record
According to Montana fish & wildlife agency, Onstadt Res was last stocked July 11, 1997 with Rainbow Trout. Onstadt Res has 1 stocking record on file, spanning 1997–1997, with about 2,000 fish stocked over that period.
By species
Angler's Field Guide
Fishing Tips & Stocking Guide for Onstadt Res
Practical advice on fish behavior, recommended tackle, and state regulations for anglers fishing in Montana.
Post-Plant Behavior & Timing
Hatchery-raised fish are conditioned to pelleted feed and open raceways. Following a release into Onstadt Res, 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 Onstadt Res was last stocked July 11, 1997, 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 Montana freshwater fishing license is required for anglers age 16 and older.Purchase Montana license online →
- •Official Rules & Limits: Bag limits, bait restrictions, and seasonal boundaries are set by Montana fish & wildlife agency.Official Montana 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 Onstadt Res:
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.
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.
Recommended Tackle for Onstadt Res
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.
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Nearby stocked waters
Other stocked waters near Onstadt Res, freshest activity first.
Briggs Pond
19 mi3 species · 53 records
Last stocked May 2026
Eightmile Springs
18 mi6 species · 72 records
Last stocked May 2026
Leningtons Reservoir
17 mi5 species · 62 records
Last stocked October 2025
Gouchenour Pond
20 mi1 species · 3 records
Last stocked June 2025
Gottfried Pond
10 mi1 species · 4 records
Last stocked May 2000
Stewart Pond 1
7 mi1 species · 28 records
Last stocked May 1999
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| July 11, 1997 | Rainbow Trout | 2,000 | 7.9" | Montana fish & wildlife agency |
Frequently asked
When was Onstadt Res last stocked?
According to Montana fish & wildlife agency, Onstadt Res was last stocked July 11, 1997 with Rainbow Trout.
What fish species are stocked in Onstadt Res?
Onstadt Res is stocked with Rainbow Trout.
How often is Onstadt Res stocked?
Onstadt Res is stocked intermittently — 1 recorded stockings between 1997 and 1997.
How many fish have been stocked in Onstadt Res?
About 2,000 fish have been stocked in Onstadt Res across 1 recorded events since 1997, per Montana fish & wildlife agency.
What size are the fish stocked in Onstadt Res?
Fish stocked in Onstadt Res average about 7.9 inches, based on the sizes the agency reported.
Do you need a fishing license to fish Onstadt Res?
Yes, all anglers age 16 and older generally need a valid Montana freshwater fishing license. Always review current regulations from Montana fish & wildlife agency for site-specific rules, bag limits, or stamps.
How do you catch stocked trout in Onstadt Res?
Freshly stocked trout in Onstadt Res 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.