We also installed two manufactured stress-laminated bridges with similar dimensions and design payloads. They were installed using the same machines and techniques. These 32 ft long, 8 in. deep panels are too heavy to move without the aid of a knuckleboom loader or excavator type machine. One used 8 in. x 8 in. cants to form three 4 ft wide panels (Figure 7), while the second used 8 in. x 4 in. material to make two 6 ft wide panels.

Figure 7. Stream crossing using 8 inch x 8 inch cants
stress-laminated to make three 4 foot wide panels.

These types of crossings (and the steel equivalents) have tremendous advantages in that they are effective, relatively low in cost, easy and quick to install, and can be moved after operations are complete. Costs for the two panel bridges are presented in Table 5. In this case they both crossed a watershed area of 7000 ac.

Purchase price	$ 3600
Transport cost	$ 300
Labor for installation 8 hrs @ $12.50/hour	$ 100
4 hours excavator @ $80/hour	$ 320
Total	$4,320
TABLE 5. Estimated costs for purchase and installation of stress-laminated cant bridges.