Figure 9.8. Coal Creek, tributary of Powder River, Wyoming (Example 7).
The location for Example 8 is near the Dyer and Lauderdale County line in western
Tennessee (Figure 9.9a). Dual bridges were built in 1963, with a 16 m (52.5 ft) main span
supported by wall-type piers in the main channel, and thirty 8 m (26 ft) approach spans
supported by concrete pile bents. In 1975, both bridges over the main channel were rebuilt,
with a main span of 22.5 m (73.8 ft) supported by hammerhead piers. Spill-through
abutments, set back from the main channel, were protected with sacked concrete in 1963
and have remained stable.
Figure 9.9a. Map showing South Fork of Deer River at U.S. Highway 51 Crossing