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© WBIR
A series of sinkholes in Sevierville are growing, despite efforts to seal them off.

The city is asking the U.S. Geological Survey to help figure out what's causing the giant hole, and several smaller ones, that are threatening sewer lines.

The sinkholes are near the bridge where Collier Drive crosses Middle Creek.

The city says they believe the bridge is sound, but the sinkholes likely threaten sewer lines.

Sevierville will set aside about $52,000 to have the USGS analyze the ground water and underground water in an attempt to figure out what's causing the sinkholes.