PlaceDossier / BC places / Wildfires / 2017
BC wildfire C10740 · 2017 · 5,648 ha
Castle Rock/Twan Lake South wildfire, 2017
The Castle Rock/Twan Lake South wildfire started on July 7, 2017, caused by lightning. It burned on through the winter and was declared out on June 18, 2018. Its mapped perimeter covers 5,648 ha: the 18th-largest of 2017's 43 large fires, and the 282nd-largest in BC since 1990. 81% of it was in Cariboo, Electoral Area K. The nearest municipality, Williams Lake, is roughly 47 km away; the fire covered about 1.5 times the land area of it.
A lot's report shows every mapped fire on it and within 2 km, with the lot drawn on the map.
Where it burned
This fireOther large fires since 1990
Outline simplified by us from the BC Wildfire Service's perimeter; not for locating a lot. Check a lot with the search above.
Sources: BC Wildfire Fire Perimeters – Historical, BC Wildfire Service; BC Wildfire Fire Perimeters – Current, BC Wildfire Service; BC Wildfire Fire Incident Locations – Historical, BC Wildfire Service; BC Wildfire Fire Locations – Current, BC Wildfire Service (Open Government Licence – British Columbia), as published on October 2, 2026; 2021 census subdivision boundaries, Statistics Canada (Statistics Canada Open Licence). Outlines simplified and places measured by PlaceDossier.
Places it reached
| Place | Burned there | Of the place's land |
|---|---|---|
| Cariboo, Electoral Area K | 4,576 ha | under 1% |
| Cariboo, Electoral Area I | 1,073 ha | under 1% |
Measured by us: the fire's mapped perimeter laid over Statistics Canada's boundaries of each municipality and electoral area. A place is listed when the fire burned any of a municipality, 25 ha or more of an electoral area, or a twentieth of the fire.
Burned before or since
1 earlier large fire had burned part of this ground.
- 2010Marguerite Ferry wildfire2,760 ha in all539 ha shared
Overlaps measured by us on the mapped perimeters, which are the outer edges: where two overlap, the ground may have burned once, twice or not at all.
The record
| Fire number | C10740 |
|---|---|
| Season | 2017 |
| Started | July 7, 2017 |
| Declared out | June 18, 2018 |
| Cause | Lightning |
| Area inside the perimeter | 5,648 ha |
| Location, as the province describes it | Twan Lake 1 |
Past fire is history, not a forecast. The chance of fire on a lot today depends on what the record doesn't show: the forest and grass around it, the slope, what has been thinned or burned since, and how far it is from a fire hall.
Before you buy or build, ask the local government or fire department about the fire protection area, FireSmart work and the distance to a fire hall, and ask your insurer what they need.
Sources: BC Wildfire Fire Perimeters – Historical, BC Wildfire Service; BC Wildfire Fire Perimeters – Current, BC Wildfire Service; BC Wildfire Fire Incident Locations – Historical, BC Wildfire Service; BC Wildfire Fire Locations – Current, BC Wildfire Service (Open Government Licence – British Columbia), as published on October 2, 2026. Outlines simplified and places measured by PlaceDossier.
Larger in 2017: Gustafsen wildfire. Smaller: Wildfire N71078. Every large fire of 2017 · all seasons since 1990 · has my property burned?