Initial Boone Dam sinkhole repaired, 24 hour-a-day work underway

The solar panel and equipment box is for a piezometer, a device which measures the pressure of groundwater at a specific point. This instrument at the site of the sinkhole will provide continuous monitoring of any additional movement in the area. (Source: TVA)

JOHNSON CITY, TN (WJHL) – The Tennessee Valley Authority reports that phase one of the Boone Dam project is finished.

The initial sinkhole discovered in October 2014 has been repaired and drainage improvements and construction of a  new control building parking area are complete, according to TVA officials.

Officials said they did a final walkthrough on repairs and downstream improvements on Monday.

Crews installed at the site of the sinkhole a piezometer, seen in the attached photo, that measures the pressure of groundwater.  This will allow TVA crews to continuously monitor any movement in the area.

Exploratory drilling and grouting is ramping up on the earthen embankment.  Overnight crews arrived Monday “signaling the beginning of the 24 hour-a-day operations”, according to the TVA.

Exploratory work on the earthen embankment continued through the snow with three sonic rigs (one of which is shown at left) drilling additional low mobility grout holes. Grout mix was then calibrated, tested and used to fill in the exploratory holes. A crane (shown at right) was also onsite last week lowering new pieces of equipment into position for future work.
Exploratory work on the earthen embankment continued through the snow with three sonic rigs (one of which is shown at left) drilling additional low mobility grout holes. Grout mix was then calibrated, tested and used to fill in the exploratory holes. A crane (shown at right) was also on-site last week lowering new pieces of equipment into position for future work. (Source: TVA)

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