The Petawawa River is one of those routes that defines what canoe tripping in Ontario means. It has everything — big lakes, tight creeks, serious whitewater, monster portages, and history layered so deep that every rapid and every campsite has a story attached to it. The river drains roughly 4,100 square kilometres of the eastern Algonquin Park interior, gathering water from dozens of lakes before dropping through a series of increasingly powerful rapids on its 168-kilometre run to the Ottawa River. It is not the longest river trip in Ontario, and it is not the most remote. But it may be the most complete: a trip that tests your paddling, your portaging, your route-finding, and your ability to read water, all within a landscape of genuine beauty.
I paddled the Petawawa for the first time in my mid-twenties, and it humbled me. I came back two years later and it humbled me differently. That is the nature of the river — it has enough complexity and enough mood to be a different trip every time you run it. Water levels change the character of every rapid. Wind changes the personality of every lake. And the forest, slowly recovering from a century of logging, changes the light and the feel of the river corridor year by year as the trees grow and the canopy fills in.
The Route: Headwaters to the Ottawa
The classic Petawawa trip starts at the river's headwaters in eastern Algonquin and finishes at McManus Lake or Lake Travers, where the river exits the park and enters Department of National Defence land. The full route typically takes six to nine days depending on pace, fitness, and how much time you spend fishing, exploring, or waiting out weather on the big lakes.
Most paddlers begin at Achray (Access Point 28) on Grand Lake, which sits on the park's east side and is reached via the Barron Canyon Road off Highway 17. From Achray, you paddle across Grand Lake, portage into Stratton Lake, and work your way west through a chain of lakes to reach the upper Petawawa. An alternate start from McManus Lake lets you paddle the river in its downstream direction without the initial lake-hopping, but you miss the eastern park landscape, including the spectacular Barron Canyon.
The headwaters section is primarily lake paddling with short portages, giving you time to settle into the trip rhythm before the river demands more. The lakes here — Catfish, Narrowbag, Little Misty — are small to medium, well-sheltered, and dotted with good campsites on granite points. Loons are constant companions, and moose sightings along the boggy shores are common in early morning and evening.
The Upper River
As the chain of lakes narrows and connects, the Petawawa begins to feel like a river. The upper sections run through wide marshland and mixed forest, with gentle current and occasional riffles. This is pleasant, easy paddling — a warm-up for what comes downstream. The landscape opens up in the marshy sections, and you can see for hundreds of metres across reed beds and sedge meadows. Osprey nest along this stretch, hunting the shallow water for the pike and perch that thrive in the warm, weedy sections.
The river gradually tightens and picks up speed as it drops through the first real rapids, most of which are straightforward Class I and Class II runs that can be scouted from shore and run with basic moving-water skills. These rapids are excellent practice for the bigger water downstream — they teach you to read the current lines, identify the V-shapes that mark the clean routes, and position your canoe for the next manoeuvre before you need it.
The Whitewater Sections
The Petawawa's reputation is built on its middle and lower sections, where the river drops through a series of named rapids that are familiar to every serious canoeist in Ontario.
Natch Rapids is often the first real test. It is a long, continuous rapid that runs roughly Class II to Class III depending on water levels, with a strong current, standing waves, and a few hydraulics that demand respect. At normal summer flows, experienced paddlers can run Natch with confidence, picking their line through the wave trains and eddying out at the bottom. At high water in late spring, Natch becomes a powerful Class III run where the consequences of a mistake are significant — the current will carry a swamped canoe a long way before the river calms enough to recover. Most groups scout Natch from the right bank before committing.
Rollway Rapids is the most notorious feature on the river. Named for the log rollways where timber was stacked before being released into the spring floodwaters, Rollway is a steep, technical rapid with a substantial drop. At most water levels, the standard advice is to portage. The portage trail around Rollway is well-established but demanding — it climbs steeply up from the river, traverses rough ground through the forest, and drops back down to the calmer water below. It is not a fun portage, but it is safer than the rapid for all but the most skilled whitewater paddlers.
Below Rollway, the river continues to drop through a succession of rapids and chutes separated by pools and flatwater sections. Some of these can be run, some should be portaged, and some demand a judgment call based on the day's water level and your group's skill. This is where experience matters — not just paddling skill, but the ability to look at a rapid, assess the risk honestly, and make the right call for your group. Pride has no place on the Petawawa.
Portages
The Petawawa's portages are part of its character. Some are short carries around rapids — a few hundred metres over well-trodden ground. Others are substantial trails that climb over ridges and through dense forest. The portages on the east side of the route, in the lake country, are generally shorter and better maintained. As you move downstream into the river sections, the portages become rougher and more demanding.
The longest portage on the standard route is roughly 2.5 kilometres, and it is every bit as exhausting as that number suggests when you are carrying a canoe and heavy packs through humid summer forest. Double-carrying — making two trips to move all your gear — is standard practice for the longer portages, which means you are walking the trail three times. This is where trip fitness matters. If you can, do some training with a loaded pack in the weeks before your trip. Your shoulders, knees, and general morale will thank you.
Trail conditions vary with the season. In spring and early summer, many portage trails are wet, with boggy sections that can swallow your boots to mid-calf. By midsummer, most trails have dried out, but root-covered sections can be slippery after rain. Watch your footing, especially when carrying a canoe — you cannot see the ground beneath your feet with a boat on your shoulders, and a twisted ankle on a remote portage is a serious problem.
Historical Significance
The Petawawa River has been a transportation corridor for thousands of years, first for the Algonquin people who travelled and fished the river system, and later for the European fur traders who used it as a route into the interior. But the river's most visible history comes from the logging era of the nineteenth and early twentieth centuries.
The white pine forests along the Petawawa were among the most valuable timber stands in eastern Canada, and the river was the highway that moved the logs to market. Every spring, massive log drives would launch millions of board feet of pine down the river, guided by crews of rivermen who lived on the water for weeks at a time, breaking jams, riding logs through rapids, and sleeping in temporary camps along the banks. The work was dangerous — men drowned every season — and the culture it produced was distinct: tough, skilled, and deeply connected to the river.
You can still see evidence of the log drives on the Petawawa. The rollways — cleared riverbank areas where logs were stacked and rolled into the water — are identifiable by their unnatural flatness and the absence of large trees. Old dam cribs, built to control water flow for the drives, appear as stone and timber structures at several rapids. And the river itself, stripped of the massive white pine that once lined its banks, has regrown in a younger, more diverse forest that is still decades away from maturity.
The logging history gives the Petawawa trip a melancholy undertone that enriches the experience. You are paddling through a landscape that was profoundly altered by human industry, and watching it slowly heal. The white pine are coming back — young trees are growing on the ridges and points — but the giants that once defined this corridor are gone, and will not return in our lifetimes.
Practical Information
The Petawawa is a trip for intermediate to advanced paddlers. You need solid flatwater skills for the lake crossings, basic moving-water skills for the runnable rapids, and the fitness to handle long portages with heavy loads. First-timers on the Petawawa should consider going with an experienced group or hiring a guide for their initial trip — the route-finding and rapid assessment decisions benefit enormously from local knowledge.
Interior camping permits are required for all backcountry camping in Algonquin Park and can be booked through the Ontario Parks reservation system. Book early for July and August departures. Permits specify your campsite for each night, so plan your route carefully and build in at least one rest day for weather delays or rest.
The standard gear list for a Petawawa trip includes a canoe suitable for both lake and river paddling (a 16 or 17-foot prospector is the classic choice), a full set of moving-water safety gear (PFD, throw bag, whistle, first aid kit), and the usual backcountry camping equipment. A spray deck or spray cover for the canoe is advisable for the whitewater sections, and painters (bow and stern lines) are essential for lining rapids you choose not to run or portage.
For paddling skill development before attempting the Petawawa, our paddling fundamentals guide covers the essential strokes, reading water, and safety practices. The river rewards preparation and punishes assumptions — come ready, and the Petawawa will give you one of the finest canoe trips in Ontario.
Getting There
Achray, the primary access point, is reached via the Barron Canyon Road, which turns south off Highway 17 roughly 25 kilometres west of the town of Petawawa. The road is paved for the first few kilometres, then becomes well-maintained gravel for the remaining distance to the lake. There is a parking area at Achray, and a ranger station where you check in and confirm your permit.
The town of Petawawa, at the river's mouth on the Ottawa, is the nearest community with full services. From there, the Ottawa Valley stretches in both directions, offering additional wilderness destinations for those who want to extend their time in the region. The Petawawa River trip pairs well with time spent exploring the broader valley — after the intensity of the river, a few days of flatwater touring on the Ottawa or crown land camping in the surrounding forest feels like a well-earned exhale.