Constructing the liner under Hwy 55/62 interchange

Below are some pictures of the multiple layers of the liner being installed in 2003.
This is the liner that isolates Hwy55/62 interchange from the Coldwater Spring watershed.
After it's proven success, it was the recipient of the 2006 Grand Award from the American Council of Engineering Companies.

For further information on what the layers are, click here.
Why the liner was necessary, click here

For information on the Coldwater Springs flow rates click here.

This is the original water levels under the 55/62 interchange bridge. It is the SAME water level as Camp Coldwater Spring. The storm sewers that were to remove this water for the road, would also lower the water levels at the spring at the same time. So the Road needed to be isolated from the spring groundwater- the reason for the liner.

First step- temporary dewatering and prepareing the base for the liner

installing layer one

Installing layer 2

Place the layers straight

The seams were then welded together- 28,000 square yards of eight-layer synthetic liner, covering approximately six acres to protect the water flow to the spring.

Sand, clay and other layers help keep it water tight. The weight of the layers and the road will hold it all in place.

The completed liner- the road bed is isolated from the groundwater. The dewatering pumps were turned off, and full flow of water to the spring returned.

1bv2

The road was then placed above the completed liner.