Williston Lake Reservoir

Large reservoir in British Columbia created by a dam

Williston Lake in northeastern British Columbia is Canada's largest reservoir, formed by the WAC Bennett Dam; anglers, boaters and industry visitors access remote camps via logging roads.

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Williston Lake at a Glance#

About Williston Lake#

Williston Lake is a large reservoir in northern British Columbia created by the construction of the W.A.C. Bennett Dam on the Peace River. Completed in the late 1960s, the dam flooded a large river valley to form the reservoir, which is used for hydroelectric generation.

The lake extends through a remote, forested landscape with numerous arms and inlets following the flooded river system; it is an important part of British Columbia’s hydroelectric infrastructure and regional ecology. Navigation, forestry access roads and a small number of communities and lodges occur along the shoreline.

Williston Lake was formed when the W.A.C. Bennett Dam was completed in 1968; the creation of the reservoir submerged valleys and altered local settlement patterns and ecosystems. It remains a working hydroelectric reservoir managed for power generation and flood control.

The reservoir lies in the northern interior of British Columbia, in a sparsely populated region of forests and mountains west of the Alberta border.

  • Access and services: The reservoir was created by flooding river valleys and has a highly irregular shoreline; boat access and remote lodges exist but services are sparse in many reaches.

How to Get to Williston Lake#

Williston Lake is accessible by road from northern British Columbia communities such as Fort St. John and Prince George; distances are long and services sparse. Plan fuel, supplies and check local conditions before traveling.

Tips for Visiting Williston Lake#

  • Plan longer stays to explore side arms of the reservoir by kayak; the lake's size rewards time on the water.
  • Be bear-aware: the surrounding wilderness is habitat for black bears and other wildlife; follow local guidance and food-storage rules.

Best Time to Visit Williston Lake#

Summer is the main season for recreation; check seasonal road conditions and wildlife advisories.

Summer
June-September · 10-25°C
Boating, fishing and wildlife viewing are at their best; long daylight in northern latitudes.
Late spring / early autumn
May & October · 0-15°C
Quieter and cooler; road access can be affected by seasonal conditions.

Weather & Climate near Williston Lake#

Climate

Williston Lake's climate is classified as Warm-Summer Continental - Warm-Summer Continental climate with cool summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -17°C to 21°C. Moderate rainfall (519 mm/year).

Air Quality: AQI 24 Good
Temperature & Rainfall
Temperature Range
21°
Warmest Month
-17°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January - -17° - -8° -17° 43 mm - - 1.5 m/s - -
February - -14° - -4° -12° 33 mm - - 1.7 m/s - -
March - -10° - 2° -7° 29 mm - - 1.9 m/s - -
April - -4° - 9° 1° 19 mm - - 2.1 m/s - -
May - 1° - 15° 7° 43 mm - - 2.1 m/s - -
June - 6° - 19° 12° 60 mm - - 2.0 m/s - -
July - 9° - 21° 15° 65 mm - - 1.9 m/s - -
August - 8° - 21° 14° 51 mm - - 1.7 m/s - -
September - 4° - 16° 9° 45 mm - - 1.8 m/s - -
October - 0° - 8° 3° 45 mm - - 1.9 m/s - -
November - -7° - 0° -6° 43 mm - - 1.7 m/s - -
December - -13° - -5° -12° 43 mm - - 1.6 m/s - -