If you have already crossed the Mille Lacs County Fair off your calendar and mentally filed August as "basically over," you are about half right. The 135th fair wrapped up its five days on August 9, and the crowd that fills the Mille Lacs County Fairgrounds every summer has gone home. But the assumption that follows the fair around town every year, that Princeton's outdoor season quietly deflates once the midway lights come down, does not hold up against what is actually still running on the Rum River.
The real story of the next few weeks is not the fair you already missed. It is a mismatch between two things that most residents lump together without meaning to: how long the river stays open for use, and how long downtown stays easy to get to.
What the Fair Actually Left Behind
This year's fair leaned into its anniversary. A new tranquility garden went in between the open class and commercial buildings, giving fairgoers a quieter corner away from the midway noise. The additions around it were not subtle: a sustainable safari brought an alligator and a kangaroo to the fairgrounds, a ninja-style obstacle course built around a 15-foot warped wall drew a crowd, and Agri-Golf let people play a nine-hole mini course between agriculture exhibits. None of that changes anything about daily life in Princeton now that it is gone. It is worth mentioning only because it marks the calendar the way locals actually read it. The fair is the town's loudest week. What comes after is usually the quietest, and this year that quiet stretch runs straight into a construction schedule that is more complicated than it looks from the outside.
The Construction Sequence Nobody Lines Up
Ask a Princeton resident when downtown gets easier and most will say "once the county road project is done." That project, the County Road 31 and 1st Street rebuild, started July 8 and was projected to wrap by the end of August. If you have been rerouting around it all summer, relief is close.
What catches people off guard is what starts almost the same week that project is supposed to finish. Sanitary sewer construction began August 18 on 7th Avenue, and the city says the work will move toward 10th Avenue as it progresses, with access maintained to properties at the end of each workday but alternate routes required while excavation is underway.
Laid side by side, the overlap is the part worth knowing:
| Project | Started | Expected to Wrap | Area Affected |
|---|---|---|---|
| County Road 31 / 1st Street rebuild | July 8, 2026 | End of August 2026 | Downtown corridor |
| Sanitary sewer, 7th Ave toward 10th Ave | August 18, 2026 | Ongoing, no end date posted | Streets between 7th and 10th |
The two projects are not related and they are not being run by the same crew, but the timing means the two or three weeks that should feel like a return to normal downtown traffic are instead the start of a second detour season. If your regular route to work, the grocery store, or the fairgrounds side of town runs anywhere near 7th through 10th, it is worth checking the city's project updates before you assume the worst is behind you.
The Side of Town the Barricades Don't Touch
None of this affects the river side of Princeton, and that is the part of the picture most people miss when they think "downtown is a mess right now" applies to the whole town.
Riverside-Riebe Park sits along Rum River Drive, away from both the 1st Street rebuild and the 7th Avenue sewer work, and it has been running its full late-summer lineup the entire time. Riverside Park has an ADA-accessible canoe launch, a fishing pier, and a swim area at the north end of the park, along with a leash-free dog park directly across the river from the campground. The campground itself has eight back-in RV sites with 30 and 50 amp hookups and three primitive tent sites, none of which depend on the downtown routes currently under construction to reach.
Next door, Riebe Park is about 27 acres, with roughly a third of that given over to a nine-hole disc golf course built through the trees along the fairway, plus its own primitive tent camping and a second dog park. The city has talked about eventually connecting the two parks with a walking bridge across the river, though that is a future plan, not something residents can use today. What both parks share right now is proximity to downtown restaurants and shops without requiring the roads that are currently torn up to get there.
A short walk from Mark Park adds the splash pad option for anyone with kids who want water without the river itself, another piece of the map that has nothing to do with the construction schedule and everything to do with what the town already built for exactly this stretch of summer.
Longer Than the Calendar Suggests
Here is the part that runs against the instinct to treat Labor Day as the finish line. Princeton's own canoe and kayak outfitter, which operates out of Riverside Park, posts its 2026 season as running weekends from 10 a.m. to 8 p.m. from March 21 through November 8, with additional weekday hours from May 1 through October 2. Rentals go out until an hour before closing, weather permitting.
That is a longer window than most people plan around. The fair ending in early August and the leaves starting to turn in October create a mental bracket that squeezes the river season shorter than it actually is. If you have been telling yourself you missed your chance to get out on the water this year because summer is winding down, the outfitter's own posted hours say otherwise. Weekday paddling holds through the start of October, and weekend rentals continue well past that, into a month most residents have already stopped thinking about the river at all.
Paddlers headed north on the Rum River should also know the Minnesota DNR has flagged a tree blocking the full width of the river between river miles 101 and 98, roughly ten miles north of Princeton near the County Road 12 bridge. It is not a reason to skip the river closer to town, but it is the kind of detail that separates someone who checked the current conditions from someone who found out the hard way.
What's Actually Worth Doing With the Next Few Weeks
With the fair behind town and the river still fully open, the practical list for the next stretch looks like this:
- Get to Riverside Park before the weekday outfitter hours end October 2 if you want a weekday paddle without waiting for a Saturday.
- Use the dog park across from the campground while the swim area is still warm enough for the kids to tag along.
- Play a round at Riebe's nine-hole disc golf course, which sits entirely outside the construction footprint downtown.
- Check the city's project page before driving through the 7th to 10th Avenue corridor, since the sewer work has no posted end date yet.
- Save the downtown restaurant run for after you have confirmed which streets are open that day, not before.
None of this requires the fairgrounds crowd or the county road project to be finished. It only requires knowing that Princeton's outdoor season and its road construction season run on two different clocks, and right now those clocks are pointed in opposite directions.
That is the kind of detail that only shows up if you are paying attention to this town week to week, not just checking in once a year for the fair. Team Lundeen works and lives right here in Princeton, and we like knowing which side of town is actually easy to get to on any given week. If you are thinking about what a home near the Rum River corridor is really worth, or just want a neighbor's read on how a street or a block is changing, reach out. Let's find your way home.
