A swamp river, not a pool-and-riffle river
The Nottawasaga Valley Conservation Authority's own warning sets the tone: this is a remote, wilderness river close to the biggest urban area in Canada, and people get stranded on it every year. The main branch runs 121 kilometres from near Alliston to Wasaga Beach and is the largest tributary of Georgian Bay. In the middle it spreads into the Minesing Wetlands, about 15,000 acres of swamp, fen and marsh, where the channel is not always obvious and, in spring, the Mad River can back up so far that paddlers have to go upstream to reach the Nottawasaga. Between Angus and Edenvale there are logjams up to a couple of hundred metres long and slippery banks to climb around them.
That character is why the fishing is spread out and quiet. The authority names the fall fishery for chinook salmon and rainbow trout in Essa Township as the one most anglers come for, and lists brook trout and river burbot as native fish along with two species at risk, lake sturgeon and northern brook lamprey. Lake sturgeon are closed all year in Zone 16.
McKinnon Road and the NVCA permit
The one piece of public land most anglers use in the wetlands comes with a fee. NVCA requires its own fishing permit on its Minesing Wetlands property from the McKinnon Road access point to the river: $57 plus HST for the calendar year, which also covers parking there, and required for anyone 18 or older. You still need an Ontario licence and must follow provincial seasons. The authority lists northern pike, rainbow trout and chinook salmon as the fish of interest at McKinnon Road, along with white and longnose sucker, carp and silver redhorse, bans ATVs and dirt bikes on its land, and says the river is not suitable for ice huts. It recommends an OFAH membership for its liability insurance and asks permit holders to respect property lines, since most of the river frontage is private.
The Boyne mouth, Nicholson Dam and the rainbow rule
Three lines in the 2026 Zone 16 summary do most of the work. From the Boyne River downstream to Georgian Bay, the Nottawasaga is open all year for Atlantic salmon, brown trout, Pacific salmon and rainbow trout under zone limits. From the Boyne downstream to the Pine River, the rainbow trout limit is zero on both licences, so the steelhead on that water go back. And in Essa Township the stretch from Highway 89 above the Nicholson Dam down to near the Boyne confluence is a sanctuary, closed from January 1 to the Friday before the second Saturday in May and again from October 1 to December 31.
Elsewhere the zone defaults apply: trout season from the fourth Saturday in April to September 30, northern pike from January 1 to March 31 and from the second Saturday in May, and bass from the fourth Saturday in June. The Boyne itself below the Earl Rowe Provincial Park dam and several nearby creeks have their own closures, so read the Simcoe listings before fishing a tributary mouth.
Upstream at Hockley, the restoration water
The headwaters are a different river. Near the Village of Hockley the Nottawasaga has cold, clean Niagara Escarpment water, and the authority's Nottawasaga River Restoration Program, running since 2018, aims to push that trout habitat downstream to the Innisfil Creek confluence southeast of Alliston by restoring 10 kilometres of eroded channel on the main river and Sheldon Creek. By 2022 about 2 kilometres had been rebuilt with bank stabilisation, woody cover and spawning channels, plus thousands of riverside trees and livestock fencing. It is small, brushy brook trout water on mostly private land; ask first.
Edenvale on the gauge
The Edenvale station sits at the downstream end of the Minesing Wetlands, where Highway 26 crosses and the NVCA conservation area has its take-out, so it reads the lower river the fall fish run. ECCC's record since 1993 gives monthly means of about 64 cubic metres per second in April, 33 in May, 12.1 in August, 11.6 in September, 14.5 in October and 21.7 in November. No shop publishes a range, so the Ideal Flow of 420 to 1,250 cfs (about 12 to 35 cms) covers the fall and late-spring means. Low water matters here for access as much as for fish: the authority's current paddling notice warns that paddlers between George Johnston Road and Edenvale may have to get out and drag through channels with little flow. On September 24 the station read 13.3 cms, about 470 cfs.