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The Nancy Creek Tunnel has been under construction stretching from the R. M. Clayton Water Treatment Plant on the Chattahoochee River, following Nancy Creek upstream, to Johnson Ferry Road. The tunnel is 16 feet in diameter, several hundred feet deep and approximately eight miles long. Upon completion, waste water from the existing surface trunk lines will be diverted into the tunnel.
Two massive tunnel boring machines worked for two years before punching through last summer. A one foot concrete liner is now installed throughout the entire tunnel with the exception of those last few hundred feet near the shafts. The grouting operation is complete from the Roswell Shaft to Johnson Ferry, and is very successful as evidenced by dramatically reduced groundwater flows into the tunnel. Flow has returned to the creeks in the vicinity of Windsor Parkway and the contractor has been instructed to remove the irrigation system. In the Shadowlawn to Roswell Road section grouting has begun, and it is expected that the dried creek near Chastain will be returned to full flow as soon as that
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