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It depends on the material and surface finish you choose.
May you choose aluminum, steel or wood? All of these material have their own particularities. Steel need constant maintenance which will increase ownership costs over time while aluminum may cost about 10% more at time of purchase but will not need maintenance at all.
For example, you may pay 75$/ft^2 for a steel footbridge but you'll have to add periodic investment to paint and maintain a steel bridge. An aluminum bridge initial costs will be about the same as a Cor-ten steel bridge but will not deteriorate over time (Weathering steel will).
For example, the average annual metal corrosion rates after long-term exposure to deicing salts with 78% relative humidity, a temparature of 70F will be in mils/year:
1) Aluminum 0.77
2) Weathering steel 31.89
3) Unprotected carbon steel 86.22
references:
http://www.maadigroup.com/lang/en/maadi-group-adds-builddesign-pedestrian-and-bicycle-bridges-to-its-specialties
http://www.imoa.info/_files/pdf/DeicingSalt.pdf
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Please be very careful when you traverse that old footbridge.
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When was Priceville Footbridge created?
Priceville Footbridge was created in 1939.
When was Wanakena Footbridge created?
Wanakena Footbridge was created in 1902.
When was Temple Footbridge created?
Temple Footbridge was created in 1989.
When was Medley Footbridge created?
Medley Footbridge was created in 1865.
When was Willimantic Footbridge created?
Willimantic Footbridge was created in 1906.
When was Summerleaze Footbridge created?
Summerleaze Footbridge was created in 1996.
When was Corktown Footbridge created?
Corktown Footbridge was created in 2006.
When was Eaton Footbridge created?
Eaton Footbridge was created in 1936.
When was Castle Walk Footbridge created?
Castle Walk Footbridge was created in 1951.
When was Teesquay Millennium Footbridge created?
Teesquay Millennium Footbridge was created in 2000.
When was Footbridge across a Ditch created?
Footbridge across a Ditch was created in 1883.
When was Jefferson Avenue Footbridge created?
Jefferson Avenue Footbridge was created in 1902.
