O'Brien Creek Fish Stocking
Montana · 1924–1978 on record
According to Montana fish & wildlife agency, O'Brien Creek was last stocked May 25, 1978 with Rainbow Trout. O'Brien Creek has 5 stocking records on file, spanning 1924–1978, with about 133,000 fish stocked over that period.
Angler's Field Guide
Fishing Tips & Stocking Guide for O'Brien Creek
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 O'Brien Creek, 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 O'Brien Creek was last stocked May 25, 1978, 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 O'Brien Creek:
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.
Cutthroat Trout Profile Tips
Known for being relatively easy to catch on dry flies, making it a favorite of western fly anglers; many subspecies are managed under catch-and-release rules to protect native populations.
Recommended Tackle for O'Brien Creek
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 O'Brien Creek, freshest activity first.
Troy Kids Pond
2 mi3 species · 214 records
Last stocked June 2026
Grouse Lake
8 mi2 species · 43 records
Last stocked May 2025
Kilbrennan Lake
10 mi3 species · 62 records
Last stocked June 2015
Savage Lake
3 mi6 species · 47 records
Last stocked July 2012
Kootenai River
9 mi3 species · 26 records
Last stocked April 2008
Shannon Lake
3 mi1 species · 11 records
Last stocked July 1989
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| May 25, 1978 | Rainbow Trout | 9,000 | 99" | Montana fish & wildlife agency |
| May 25, 1978 | Rainbow Trout | 9,000 | 99" | Montana fish & wildlife agency |
| July 18, 1925 | Cutthroat Trout | 35,000 | 0 | Montana fish & wildlife agency |
| July 19, 1924 | Cutthroat Trout | 40,000 | 0 | Montana fish & wildlife agency |
| July 19, 1924 | Cutthroat Trout | 40,000 | 0 | Montana fish & wildlife agency |
Frequently asked
When was O'Brien Creek last stocked?
According to Montana fish & wildlife agency, O'Brien Creek was last stocked May 25, 1978 with Rainbow Trout.
What fish species are stocked in O'Brien Creek?
O'Brien Creek is stocked with Rainbow Trout and Cutthroat Trout.
How often is O'Brien Creek stocked?
O'Brien Creek is stocked intermittently — 5 recorded stockings between 1924 and 1978.
How many fish have been stocked in O'Brien Creek?
About 133,000 fish have been stocked in O'Brien Creek across 5 recorded events since 1924, per Montana fish & wildlife agency.
What size are the fish stocked in O'Brien Creek?
Fish stocked in O'Brien Creek average about 99.0 inches, based on the sizes the agency reported.
Do you need a fishing license to fish O'Brien Creek?
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 O'Brien Creek?
Freshly stocked trout in O'Brien Creek 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.