Field Guide / 009 / 134

RegionBonnechere Valley, Ontario

Best WindowLate May through Thanksgiving for Bo…

Verified2026-05-05

Bonnechere Valley.

45.54° N77.10° WBonnechere ValleyOntario24 activitiesVerified · 2026-05-05

01 — Abstract

Bonnechere Valley is a rural Renfrew County township anchored by the village of Eganville, where the Bonnechere River cuts through the valley between the Algonquin Highlands and the Ottawa Valley. About 8 km east of Eganville on Fourth Chute Road, the Bonnechere Caves drop visitors below the river through Ordovician limestone passages exposing marine fossils — cephalopods, trilobites, and gastropods set into the cave walls — on guided tours running late May through Thanksgiving.

The township was formed January 1, 2001 by amalgamating the village of Eganville with the townships of Grattan, North Algona, and Sebastopol, and includes the hamlet of Foymount in the southwest, sitting at roughly 520 metres elevation on a former Pinetree Line radar station site (closed 1974) — one of the highest occupied points in southern Ontario. The Bonnechere River corridor through the township carries flatwater paddling, smallmouth bass and walleye fishing under FMZ 15, and a Highway 41 scenic drive that connects Eganville south toward Pembroke and west toward Algonquin Park's east-side gateways.

Bonnechere Provincial Park, despite the shared name, sits downstream toward Round Lake outside the township boundary.

02 — Conditions

Today's read.

Air Quality

22

eu-aqi · low

UV Index

0.9

scale 0–11

Humidity

61%

relative

Visibility

29.3 km

clear

Temp

+2.1°

H 15° · L -3°

Sun

05:40 / 20:28

14h 48m daylight

A+

GOOD DAY TO BE OUTSIDE

Real-time conditions updated; AI field notes unavailable.

9-day high · -3° → 15°

03 — Claims

On the record.

Every claim sourced. Click through to the original.

04 — Featured

4. activities
worth your time

▲ signature · 1strong · 3also available · 20

Strong

01Mid-May through October

Paddling — Flatwater

The Bonnechere River through the township is the obvious paddling spine — flatwater stretches connect through Eganville and east toward Fourth Chute, with the named chutes on the river marking portage points (Fourth Chute is the most prominent, just upstream of the Bonnechere Caves). Inland, Constant Lake supplies a quiet flatwater option in the township interior; Round Lake straddles the eastern boundary toward Killaloe and offers larger open-water paddling on the route to Bonnechere Provincial Park downstream. The river continues east into Bonnechere Provincial Park beyond the township boundary — that section sits in adjacent municipality and is out of the strict in-township scope.

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Strong

02Smallmouth bass season opens fourth …

Freshwater Fishing

Bonnechere Valley sits in Ontario Fisheries Management Zone 15, with the Bonnechere River through the township and the inland lakes (Constant, plus Round Lake on the boundary) carrying smallmouth bass, walleye, and northern pike. The river's named pools and chutes — Fourth Chute being the most prominent — concentrate fish along the township stretch east of Eganville. FMZ 15 sits within Ontario's Central Bait Management Zone, so live or dead baitfish and leeches may not be transported into or out of the zone; Ontario fishing licences are required across all waters.

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Strong

03Late May through Thanksgiving for Bo…

Heritage & Culture

The Bonnechere Caves carry a layered heritage story alongside the geology — Tom Woodward's mid-century development of the cave-tour operation gave the township its longest-running visitor draw. In Eganville, the Bonnechere Museum (run by the Eganville & District Heritage Society) anchors the village's local-history interpretation through displays on the river, the lumber trade, and the early settlement of the valley. In the southwest of the township, Foymount sits at roughly 520 metres elevation on the former site of CFS Foymount, a Royal Canadian Air Force Pinetree Line radar station operational from 1962 to 1974 — Cold War heritage on what's described as one of the highest occupied points in southern Ontario, with open vistas back toward the Ottawa Valley.

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▲ Signature

04Late May through Thanksgiving (opera…

Geology & Discovery

The Bonnechere Caves sit on the Bonnechere River about 8 km east of Eganville on Fourth Chute Road, dropping visitors below the river surface through Ordovician limestone passages. Marine fossils — cephalopods, trilobites, and gastropods — are visible on the cave walls; guided tours have run since Tom Woodward began developing the system for visitors in the 1950s. The caves operate seasonally from late May through Thanksgiving and are the township's headline draw — the most-developed publicly-toured Ordovician karst cave in Ontario. Above ground at the Caves grounds, short interpretive paths around Fourth Chute add a river-and-fossil-bedrock context to the underground tour.

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04b — Also available

20. more outings
surveyed.

Activities supported across Bonnechere Valley without a featured write-up.

01
Hiking
family-friendly-walking
02
Trail Running
Available
03
Walking & Strolling
Eganville village core (Bonnechere River frontage)
04
Camping
frontcountry
05
Nature & Discovery
nature-interpretation
06
Cycling
road
07
Mountain Biking
Available
08
Caving
Bonnechere Caves (guided tour — handled under Geology & Discovery)
09
Paddling — Whitewater
Bonnechere River chutes (Fourth Chute and others — limited)
10
Sailing & Boating
motor-boating
11
Swimming & Beach
lake-swim
12
Cross-Country & Nordic
classic-xc
13
Snow Adventure
snowmobiling · snowshoeing
14
Sky Watching
stargazing
15
Seasonal Phenomena
fall-colours
16
Wildlife Viewing
Available
17
Motorized Touring
scenic-drive
18
Indigenous Experiences
Algonquins of Pikwakanagan First Nation programming at Golden Lake (adjacent municipality)
19
Food & Drink
Eganville village restaurants
20
Arts & Craft
Available