SCDOT CHS & US78 & SC7 Bridges
project included two bridge replacements - one at US-78 at Rivers
Avenue, the other at SC-7 at Cosgrove Avenue in North Charleston. The
US-78 bridge is 1,200 feet long and 44 feet wide. It contains 13
drilled shafts, two of which are 175 feet long, as well as 36-inch
diameter stone columns at each approach and a 24-inch pile at each
end bent. Demolition of this bridge was completed over Meeting Street
and multiple existing CSX and Norfolk Southern railroad tracks. The
new bridge was constructed to span over five future tracks going into
the Charleston Port. The concrete portion also includes two large
crash walls to protect the bridge foundation from derailed trains.
The SC-7 bridge is 860 feet long and 72 feet wide and contains 20 drilled shafts, all 100 feet long. It also includes 42-inch diameter stone columns at each approach, along with earthquake drains, and HP14x73 pile at each end bent. Demo of the bridge was completed over Meeting Street and existing CSX and Norfolk Southern railroad tracks and through the middle of an active concrete plant. The new bridge was constructed in two phases to keep Cosgrove Avenue operational during the replacement. It was also built for future tracks going into the Charleston port. Crowder completed both bridges within contract time and was awarded the 2017 Highway Heavy >$5 million Pinnacle from the Carolinas AGC.