TTL Geotechnical Engineers Investigating ODOT Slope Failure

In mid-November, ODOT District 2 crews noticed the pavement was cracked in the shoulder of westbound State Route 269 exit 125, just north of the Sandusky Bay Bridge, between Sandusky and Port Clinton, Ohio. After ODOT engineers measured an inch difference in pavement heights, the shoulder and exit ramp were inspected and closed. The pavement failed shortly after. Our geotechnical engineering group was requested by ODOT District 2 to expedite drilling, lateral movement instrumentation (inclinometer) installation, and evaluations for the pavement failure. TTL engineer personnel visited the site within hours of notification from ODOT. Inclinometer materials were ordered and received, a scope and fee estimate was prepared, and drilling commenced within 5 days of the request by ODOT. TTL has been evaluating potential causes of the pavement failure, including slope instability and/or karst features (such as sinkholes).

Top Left: Closed ramp from westbound SR 2 to northbound SR 269 (Exit 125) in Ottawa County – taken from ODOT district 2 website. Bottom Left: TTL geotechnical engineer Kate Hennicken, P.E., records soil displacement using an inclinometer.