Thornton Lake, Lower Fishing Regulations
Whatcom County, Washington · 2026 size limits, bag limits, and seasons
Thornton Lake, Lower is a lake in Whatcom County, Washington. It has its own fishing regulations for 1 species, including Cutthroat Trout. These rules replace Washington's statewide limits on this water.
Fish with special rules on Thornton Lake, Lower
Tap a fish for identification tips, size records, and the best bait.
Thornton Lake, Lower limits by species (2026)
| Species | Size limit | Daily bag | Season |
|---|---|---|---|
 Cutthroat TroutNo daily limit. · No min. size. | – | – | Year-round |
– means no limit is listed for this water. Rules not shown here follow Washington's statewide regulations.
Plan your Thornton Lake, Lower trip
Thornton Lake, Lower fishing: common questions
What fish have special regulations on Thornton Lake, Lower?
1 species has rules specific to Thornton Lake, Lower: Cutthroat Trout.
What is the cutthroat trout limit on Thornton Lake, Lower?
No size limit is listed for Cutthroat Trout on Thornton Lake, Lower.
Do Washington statewide fishing rules apply on Thornton Lake, Lower?
Where Thornton Lake, Lower has its own rule for a species, that rule replaces the statewide limit. For species not listed on this page, Washington's statewide regulations apply. Regulations are set by the Washington Department of Fish and Wildlife; confirm with the official 2026 regulations before keeping a fish.
Other Washington waters with special regulations
- Yakima River · Benton
- Columbia River
- Wind River · Skamania
- Drano Lake · Skamania
- Naselle River · Pacific
- Roosevelt Lake · Ferry/Grant/Lincoln/Okanogan/Stevens
- Cowlitz River · Cowlitz/Lewis
- Green River · Duwamish
- Grays River · Wahkiakum
- Nisqually River · Pierce/Thurston
- Nooksack River · Whatcom
- Humptulips River · Grays Harbor
Take Thornton Lake, Lower rules on the water
Identify your catch, check if it's a keeper, and log it. CatchVault is on iOS, with Android on the way.