High · Low
Solid today
reservoir / Campbellville, ON / FMZ 16Mountsberg Reservoir
Mountsberg Reservoir is a shallow, weed-choked marsh with a flood-control dam bolted on one end. Bronte Creek backs up behind the Mountsberg Dam — 1967 vintage, one of Conservation Halton's four Hurricane Hazel dams — spreading into roughly 190 hectares of warmwater marsh inside Mountsberg Conservation Area at Campbellville.
Target Species
Today's read.
Quick Summary
Cool, with a high of 12° and a low of 2°. Breezy, gusts to 45 km/h. Falling pressure often fires up the bite.
Daily max · 0-11
Avg · NW · gusts to 45 km/h
falling · -6 hPa/24h
10h 21m daylight
Lunar phase
Dry through the launch window
B+
Solid today
Choppy — a 10 km/h average over 3.1 km of fetch keeps you on the southeast shore with short runs. Gusts spike to 45 km/h at times — check the hourly and time your launch. The bite should be firing — a falling barometer often trips a pre-front feed. Fish the southeast shore where wind stacks bait and keep it tight to cover.
Craft Verdicts
No trailer launch in seed dataCarry-in launch3.1 km max fetchPressure falling (-6.2 hPa/24h)
Powerboat
No trailer ramp here — a powerboat can't launch.
Kayak
Clear to launch — a 10 km/h NW average over 3.1 km of fetch stays well within a kayak's low, wind-caught profile; easy to hold position. Gusts spike to 45 km/h at times — time your launch.
Canoe
Launchable but exposed — a 22 km/h average gust and 3.1 km of fetch will test an open canoe's shallow draft; put in on the southeast shore and stay tight to it. Gusts spike to 45 km/h at times — time your launch.
Hourly Conditions
5:00 a.m.
5°Temp
UV0
Precip0.0mm
PressureFalling
Fish ActivityMaximum
Wind · NW10kph
Gust10kph
Launch ReadFishable
7:00 a.m.
5°Temp
UV0
Precip0.0mm
PressureFalling
Fish ActivityMaximum
Wind · W9kph
Gust9kph
Launch ReadFishable
9:00 a.m.
5°Temp
UV0
Precip0.0mm
PressureFalling
Fish ActivityMaximum
Wind · W8kph
Gust8kph
Launch ReadFishable
11:00 a.m.
9°Temp
UV1
Precip0.0mm
PressureFalling
Fish ActivityMaximum
Wind · W9kph
Gust30kph
Launch ReadCaution
1:00 p.m.
10°Temp
UV3
Precip0.0mm
PressureFalling
Fish ActivityHigh
Wind · NW12kph
Gust40kph
Launch ReadCaution
3:00 p.m.
12°Temp
UV3
Precip0.0mm
PressureFalling
Fish ActivityHigh
Wind · NW12kph
Gust36kph
Launch ReadCaution
5:00 p.m.
11°Temp
UV1
Precip0.0mm
PressureFalling
Fish ActivityMaximum
Wind · NW12kph
Gust31kph
Launch ReadCaution
7:00 p.m.
8°Temp
UV0
Precip0.0mm
PressureFalling
Fish ActivityMaximum
Wind · NW10kph
Gust10kph
Launch ReadFishable
9:00 p.m.
6°Temp
UV0
Precip0.0mm
PressureFalling
Fish ActivityMaximum
Wind · NW9kph
Gust9kph
Launch ReadFishable
Weekly Outlook
LaunchCaution
BiteMaximum
LaunchAll Clear
BiteFair
LaunchAll Clear
BiteFair
LaunchAll Clear
BiteHigh
LaunchAll Clear
BiteMaximum
LaunchAll Clear
BiteMaximum
LaunchFishable
BiteMaximum
01
How it fishes
The reservoir's marsh is a provincially significant waterfowl staging area and a regionally significant waterfowl breeding area, and "supports a vibrant warmwater fish community."
SourceMountsberg Dam (1967) is one of Conservation Halton's four major flood-control dams built in the aftermath of Hurricane Hazel (1954).
SourceNorthern pike are prominent enough that the watershed study recommended a pike management strategy to limit their impact on the native fish community.
SourceMountsberg is one of only a handful of Conservation Halton properties where recreational fishing is permitted (Kelso, Hilton Falls, Mountsberg, Robert Edmondson).
Source02
Regulations snapshot
This is a summary, not the legal regulation — confirm current rules with the official source before fishing.
Largemouth Bass
Season: fourth Saturday in June to November 30 (2026: Jun 27–Nov 30)
Limit: S-6 / C-2 (combined with Smallmouth Bass)
Size: no size limit
Official sourceNorthern Pike
Season: January 1 to March 31 and second Saturday in May to December 31 (2026: May 9–Dec 31)
Limit: S-6 / C-2
Size: no size limit
Official source03
Access notes
Mountsberg Dam launch
Hand-launch / carry-in for canoes, kayaks, and larger non-motorized vessels (larger craft launch only at the dam). No gas motors; electric trolling motors are the only motorized exception.
Access sourceShoreline carry-in near the parking lot
Smaller craft can be carried a short distance from the parking lot to shore.
Access source04
Key resources
The actual regs, straight from the source — FMZ 16, Government of OntarioFishing rules, the live-bait ban, and where to launch — Conservation HaltonPark hours, fees, and gate — Mountsberg Conservation Area, Conservation HaltonThe marsh and its warmwater fishery — Bronte Creek Watershed Study, Conservation Halton (2002)