We created a spreadsheet that breaks down lane miles into regions of the State. There are different costs based on the region in which the road was constructed. We determined the average year that the roads were constructed in that region. Current costs to construct roads will be deflated back to the average construction date to arrive at historical cost. Right of way cost data for right of ways was not available.
Data regarding current appraised values did exist.
Bridges the bridge that connects upper and lower peninsula of the State and some of the bridges that span from Michigan to Canada, are responsibilities of entities outside of the primary government. For the remaining bridges, MDOT has historical cost data. However, bridges and overpasses within Michigan will be valued using a process similar to the roads. Rest areas these will be valued separately, but included as infrastructure assets because they represent an ancillary part of the infrastructure network. Railways and airports records exist regarding the purchase price.