All you have to do is shovel it and there should be no excuse as to why it couldn't be. This is Canada and it snows. A lot.
Here are two bridges in Scandinavia that see year round use and aren't over engineered with rooftops and heaters to melt snow on the roof, they simply clear the snow and it works without having to spend an exorbirant amount of money on a complex footbridge. A wee bit of snow coming down from the sides as it got shoveled ought to not cause an accident. Snow flies off trucks and regular road bridges and overpasses quite often. It can be a shock if you're driving but it's not frequently an issue or anything, or there'd be more protection. But even if you needed some, you could just to a regular old footbridge and have some mesh extended out on the sides, which can break up any snow that may fall and dissipate it as it went down to the road underneath. I can't think of any bridges that really do this around here, though.
A series of 3 footbridges by Studio Granda in Reykjavík, Iceland. Runs over a motorway and causes no problems.
Here are two bridges in Scandinavia that see year round use and aren't over engineered with rooftops and heaters to melt snow on the roof, they simply clear the snow and it works without having to spend an exorbirant amount of money on a complex footbridge. A wee bit of snow coming down from the sides as it got shoveled ought to not cause an accident. Snow flies off trucks and regular road bridges and overpasses quite often. It can be a shock if you're driving but it's not frequently an issue or anything, or there'd be more protection. But even if you needed some, you could just to a regular old footbridge and have some mesh extended out on the sides, which can break up any snow that may fall and dissipate it as it went down to the road underneath. I can't think of any bridges that really do this around here, though.
A series of 3 footbridges by Studio Granda in Reykjavík, Iceland. Runs over a motorway and causes no problems.
The White Arkitekter office in Stockholm, Sweden. Crosses over some parking, pathways and a small road. Works just fine.