Provincial Road 399 — Gypsumville to Pinaymootang via Lake St. Martin West Shore Backroads
Interlake limestone and flood-plain gumbo.
PR 399 from Gypsumville west toward the Pinaymootang First Nation community doesn’t get talked about, and after the catastrophic 2011 Assiniboine River flood that inundated much of this corridor, large sections were rebuilt on raised grade — but the side roads and lake access tracks that branch off toward Lake St. Martin’s west shore are still raw, low-lying, and heavily seasonal. The limestone bedrock just below the surface means drainage is either perfect or non-existent, and the clay over-burden sections turn into axle-deep gumbo after any significant rain. Watch for the causeway section near the lake outlet — it floods with little warning in high-water years.
Rated Moderate in dry summer conditions, this route earns Difficult fast when the weather turns. A stock 4WD with decent ground clearance can handle the main PR 399 corridor in summer, but the lake access spurs want a high-clearance rig with good mud tires and a recovery kit. Best season is mid-July through September. No permit required. Fuel in Gypsumville before heading north — there’s nothing in Pinaymootang. What you get is an honest slice of the Manitoba Interlake: big skies, limestone outcrops, waterfowl in numbers that’ll stop you cold, and almost no other traffic.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | High Clearance, Overland Route |
| Surface | Dirt, Gravel, Mixed |
| Features | Historic, Remote, Scenic, Water Crossings |
| Length (miles) | 42 mi / 67.6 km |
| Duration | 1 day |
| Max elevation (ft) | 870 ft |
| Best season | July-September |
| Minimum vehicle | High-clearance 4WD |
| Nearest town | Gypsumville, Manitoba |
| Land manager | Manitoba Transportation and Infrastructure |
| Permit required | No |
| Cell service | Spotty |
| Water crossings | Yes |
| Dispersed camping | No |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
Can a stock Tacoma or 4Runner handle PR 399, or does it need a lift?
A stock high-clearance 4WD like a Tacoma or 4Runner is the minimum — this trail is rated exactly that for a reason. The flood-plain sections can throw deep ruts and soft gumbo mud at you, so a lift helps but isn't mandatory if you're running decent all-terrain tires and know how to read wet ground.
What's the window to drive this before the road turns to soup?
July through September is your window — the Interlake flood plain around Lake St. Martin drains slowly and spring conditions can leave sections impassable well into June. Avoid it after heavy rain regardless of month; that limestone-and-clay mix turns greasy fast and will swallow tires without much warning.
Do you need any permits or fees to drive PR 399 through Pinaymootang First Nation territory?
No permit or fee is required to transit PR 399 as a public road, but you are passing through Pinaymootang First Nation land — stay on the road, respect posted signage, and don't camp or explore off-route without permission from the community.
What's the worst section and what exactly makes it hard?
The flood-plain stretches in the middle of the route are where things get serious — low elevation, poor drainage, and gumbo clay that hides under a deceptively dry-looking surface. If you punch through the crust and sink, recovery is ugly because the terrain is flat and anchor points are scarce, so bring a good kinetic rope and ideally a second vehicle.
How far is the nearest gas from the start, and is there reliable water along the route?
Fill up in Gypsumville before you leave — there are no fuel stops on the 42-mile route and the next reliable option is well past Pinaymootang. Don't count on water sources along the trail for drinking; carry everything you need, as the flood-plain water is not safe to treat and use without serious filtration.
Trail track
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