The article examines the costs and deterioration issues of modern timber bridges in Mississippi. Cost comparisons between timber and concrete bridges were inconclusive, but a case study in Alabama showed similar costs for both types. Modern timber bridges were chosen for their quick installation and cost-effectiveness in certain situations. Rainwater was found to damage both wood and concrete bridge components, emphasizing the need for maintenance programs. Treated timber was shown to be a durable structural material, with many creosote-treated wooden piles lasting 30-40 years. Proper installation and maintenance are crucial for the longevity of timber bridges in Mississippi.