There are more than a dozen entry points into British Columbia, Canada from Washington State. Most of them are lightly used with the majority of traffic passing through the Vancouver area border crossings in Blaine, Point Roberts, Sumas and Lynden.
Of the crossings in Blaine the Peace Arch border crossing is the busiest and can often have very long wait times. It is common for travelers to take some time out in the Peace Park whilst waiting to get through the border. The Pacific Highway border crossing is where commercial traffic must pass and as such is the busiest commercial route from the US to Canada in the western states and one of the busiest commercial ports of entry of all the US / Canadian crossings. The Point Roberts border crossing is unusual in that Point Roberts is a tiny enclave unreachable by US soil, and an oddity created by the original decision to locate the US / Canadian land border on the 49th parallel.
You can view the Vancouver border wait times for the aforementioned crossings using the following links:
Pacific Highway Border Wait Times
Point Roberts Border Wait Times