According to the city's Senior Civil Engineer, Stan Aiken, after the pipe failed, excessive rain caused a portion of the road to be undermined.
"Public Works crews were called to the scene yesterday (Tuesday) afternoon to assist with the damage. A contractor is being brought in to repair the road and a detour has been posted for citizens wishing to access homes in the 2500 and 2600 blocks of Lenox Drive. The damage occurred about 600 feet past Cannon Ridge Court."
http://accesswdun.com/article/2013/7/263384