October 22, 2021
Monitoring of Trail Bridge "Sinkholes" Continues
As part of our routine monitoring efforts, EWEB conducted a bathymetric survey of Trail Bridge Reservoir in May 2021 and found unusual depressions. EWEB conducted follow-up inspections with a remotely operated underwater vehicle along with dye testing by divers in early June 2021. Based on the dye tests, the two larger depressions are actively taking water and are considered sinkholes. Subsequent dye testing and geophysical investigations in July and August indicated that there is no concentrated seepage flow through or under Trail Bridge Dam.