The environmental impact on the Bonner bridge and road was not fully understood at the time of construction, and now constant beach erosion, severe weather and high volume of traffic continually forces the state to protect the integrity of the road system. As much as $50 million was spent between 1987 and 1999 to repair and protect the Bonner Bridge and NC 12 from the ocean. The bridge was due for replacement by the early 1990s but construction on the new bridge had been continually held back by environmental lawsuits brought by the Southern Environmental Law Center.