Clark County is responsible for maintaining 2,665 lane miles, roughly the driving distance between Vancouver and Atlanta. When there is a major winter storm which typically only happens once every five years, the county focuses its plowing efforts on the busiest roads to keep people, goods and services moving.

You can examine the county’s Snow Route Map to find out which streets have top priority for clearing and which streets are classified as important transportation routes, but not critical.

No. Clark County's plows cannot apply heavy down pressure, besides the weight of the blade itself, and cannot scrape down to pavement through thick ice or heavy snow, particularly when it has been compacted by traffic. 

Salt brine, a mix of water and salt that is 23.3 percent salt, is used to pretreat roads before a storm arrives. The solution inhibits ice crystals from binding to road pavements. Clark County occasionally sprays salt brine as a de-icer once snow and ice has accumulated. 

Because of the county’s mild winters, not that much salt is used, so the environmental effects on streams, rivers and groundwater is minimal.

The Washington State Transportation Center conducted a study along SR 97 in Chelan County, from December 1999 to May 2000. Despite significant use of chloride products for snow and ice control, there was no measurable negative impact on Peshastin Creek, a fish-bearing stream that parallels a portion of the state highway.

All the same, you should consider washing your vehicle following a snowstorm to reduce the corrosive effect on exposed metal

We use sanding rock on some hills, curves and other trouble spots. In heavy traffic, sanding rock is quickly thrown to the side and must be swept up during post-storm cleanup. It also can clog drainage systems and harm aquatic life if washed into waterways. The cost of applying sanding rock is an expensive alternative at about $93 per lane mile, including post-storm sweeping, compared with $5 per lane mile for salt brine.

Under Clark County Code, the county is not responsible for removing snow and ice from private driveways or roads or at their intersections with county roads. County equipment can be used only for snow removal and ice control on county roads.
Clark County Code 12.24.030 - Snow Removal and Ice Control, Driveways and other roads