In Fall Mack Days, Polson's Most Valuable Lake Trout Is Usually the Small One

"We set a goal to reduce lake trout, to not eliminate the opportunity, but make room for the native fish." That is how Barry Hansen described the thinking behind the Confederated Salish and Kootenai Tribes' fisheries program in an April 2026 profile for Hagadone News Network, published as he finished a 36-year career with the fisheries program.

That one sentence explains almost every rule in Fall Mack Days, which runs on Flathead Lake from Thursday, September 10, through Sunday, November 8, 2026. The contest is a removal program dressed as a fishing derby. Once you read the rulebook that way, the scoring stops looking odd. A 20-inch laker that would never make a wall mount counts for more in this contest than a 34-inch fish you are legally required to put back.

The scoring counts fish, not inches

Every lake trout under 30 inches earns a lottery ticket. A fish over 30 inches earns none. Lake trout between 30 and 36 inches are in a protected slot, and keeping one on Flathead Lake is illegal. Bull trout and westslope cutthroat go back immediately. Bull trout are listed as threatened under the Endangered Species Act, cutthroat are a species of special concern, and staff are required to report any bull trout turned in by mistake.

The cash follows the same logic. Top Angler is a volume award, with the Top 20 prizes running from $950 down to $200. The top 10 are scored on their best 18 of the 26 Friday-through-Sunday fishing days. The contest even pays for the opposite of a trophy. The 2026 awards sheet lists two $250 prizes for the smallest fish. As of September 30, Larry Karper held that category with a 144-millimeter lake trout, a little under six inches.

A large-fish category does exist, paying $500. The rules set the bar at a lake trout over 36 inches and 20 pounds, with a dated, timed photo showing its length. The revised poster lists only a $500 prize for the largest lake trout, so read the rules before you count on it. Three weeks in, nobody had entered a large fish.

The jackpot fish are hidden, and that fits the design too

The big money sits in tagged fish. CSKT and Montana Fish, Wildlife & Parks staff have tagged and adipose-fin-clipped more than 9,000 lake trout around the lake. Each carries a PIT tag implanted under the skin, so you cannot see it. The 2026 rules list one $10,000 tag, two $5,000 tags, five $1,000 tags, and more than 9,000 worth $100 to $500. The revised event poster lists three $5,000 tags instead of two.

Since the tag is invisible, the only way to know whether a fish is worth $100 or $10,000 is to bring it in and have staff at Blue Bay scan it. Apart from the large-fish category, this is how a fish over 30 inches can still pay. If you are on the south half of the lake and land one with a clipped fin, the rules let you bring it in for scanning. The rules also ask anglers to put a rubber band or zip tie on the tail or gill plate of any fin-clipped fish so it gets scanned. They warn that some anglers clip fins themselves, so a clipped fin alone does not guarantee a tag.

The $10,000 fish has been caught three times since the contest began in 2002, according to Montana Outdoor's September 30 update. Any prize over $600 requires the winner to be 18 or older and entered in the event. Anyone earning $600 or more has to turn in a W-9, and Blue Bay keeps the forms on hand.

Where the 2026 count stood after three weeks

As of September 30, 2026, anglers had turned in 5,632 lake trout. Eight tagged fish had been caught, worth a little over $1,000 combined. For a rough comparison, the Lake County Leader reported 5,173 fish after two weeks of the 2025 fall contest, up from 4,201 at the same point the year before. The 2025 figure covers two weeks and the 2026 figure covers three, so they mark pace rather than an even comparison.

Standings as of September 30, 2026:

The Lake County Leader ran the same week-three numbers on October 1. Treat this table as a dated snapshot. The contest's live spreadsheet updates on its own schedule, and the Mack Days statistics page warns that tallies can run a day or two behind.

Even a strong fall makes up only part of the removal effort. In 2023, the Tribes' program harvested 112,514 lake trout against a target of 140,000, and Fall Mack Days accounted for 17,502 of them. From 2002 through 2022, Mack Days and gillnetting together removed 989,961 lake trout, with 251,600 coming from the fall contests.

Running the contest from the Polson end of the lake

Entry is free. Paper applications are available at Walmart in Polson and at the CSKT Natural Resources Department offices in Polson, and the poster also lists Zimmer's Tackle in Pablo. You still need the right fishing license for where you fish, and a special tribal license is available for the south half of Flathead Lake. Any boat used outside the Flathead Basin needs an inspection before it joins. The CSKT office in Polson is a courtesy inspection station by appointment.

The weekly rhythm follows where fish can be checked in:

1. Monday through Thursday: Blue Bay, the event headquarters on the east shore, is the only check-in. It runs from noon until a half hour before sunset. After 6 p.m., you bag your fish and leave them in the drop box. A campground directory puts Blue Bay 8.2 miles from Polson.
2. Friday through Sunday: Blue Bay stays open from noon until a half hour before sunset or 9 p.m., whichever comes first. Short pickup windows also open around the lake, at Somers Boat Access from 4 to 4:30, Wayfarers and Big Arm Boat Ramp from 5 to 5:30, and Salish Point in Polson from 6 to 6:15.
3. Before you count on Salish Point: call 406-270-3386 to say you are out at the site. On bad-weather days, crews may skip the outlying stops unless they know anglers are waiting.

Salish Point and Riverside are both Polson public parks with boat ramps, and Big Arm State Park's ramp is open year-round. FWP's lake guide names the Polson City Docks and the Polson bridge as fall shore-fishing spots. Every fish has to be entered the day it is caught, and pooling catches between anglers is prohibited. The event says its check-in schedules can change, so confirm on mackdays.com before the weekend.

Sunday, November 8 runs as a separate last-day event. All fish are due at Blue Bay only, by 3 p.m. That day has its own drawings of $400, $350 and $300, along with a $300 prize for the day's top angler.

The first fall without the people who built it

The rulebook's logic comes from a specific history. Hansen traced the collapse of Flathead Lake's native bull trout and westslope cutthroat, which were nearly gone by the 1980s, to mysis shrimp introduced decades earlier. Young lake trout fed on the shrimp and grew into adults that competed directly with the native fish. Mack Days was the first response. Gillnetting, which Hansen oversaw, was added in 2014.

That generation of staff has now stepped away. The April 2026 profile reported that Hansen and Cindy Benson, who oversaw Mack Days for more than two decades, were both set to retire the following month, and that fisheries program manager Les Evarts had retired earlier in the year. This fall's posters and updates name CSKT Fisheries' Joe Santos as the contact.

The fish taken out of the lake go into a local supply chain. Before Native Fish Keepers, the Tribes' nonprofit corporation, was set up in 2017, employees donated their lake trout and whitefish catch to local food banks. Fish processed through the company are now sold to local grocery stores and distributors. The processing center at Blue Bay employs about half a dozen people. Hansen estimated that those sales cover only about a quarter of total program costs.

His assessment of the results was plain. Native fish numbers haven't rebounded, he said, but they aren't dropping either. "I'm beginning to see that as success, that we're holding the line," he said. "If we stop, we lose what we've gained." Each sub-30-inch fish handed in at Salish Point this fall is one small part of that work.

At Your Montana Road Home, we follow the seasonal rhythms that shape life along Flathead Lake, from Blue Bay check-ins to Sunday evenings at Salish Point. If you're thinking about a place in Polson where the lake sets the calendar, start your Montana road home and book a consultation with Crystal.

This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.