May 31, 2019

City Crews Begin To Fill Whitewood Street Sink Hole

City crews have begun filling the Whitewood Street sink hole with rock material to stabilize the area within the sink hole. City crews have begun filling the Whitewood Street sink hole with rock material to stabilize the area within the sink hole. (City Photo/Darrell Shoemaker)

CITY CREWS BEGIN TO BACKFILL

WHITEWOOD STREET SINK HOLE

Investigation continues into cause, area impacts

RAPID CITY, SD (May 31, 2019)--City crews at mid-day Friday began the process of backfilling a large sink hole area in the 300 block of Whitewood Street.  City officials expect crews will be in the area into next week to complete the process.

            "We are continuing our investigation and it's important we get in there and stabilize the sink hole," said City Public Works Director Dale Tech.  "The sink hole remains active with episodes of erosion taking place beneath the road surface."

            Tech says crews are beginning the process of backfilling the hole, initially with rock material and then eventually dirt.  Tech expects the process to take several days given the depth of the sink hole.

            "City officials in conjunction with geo-technical consultants from FMG Engineering, Inc. are continuing their investigation and are continuing to assess any potential impacts in the proximity of the sink hole area," said Tech.  "Our continued investigation does not impact getting the hole stabilized and filled."

                Tech says the cause of the sink hole appears to be nature-related.

                The sink hole emerged early Thursday morning and was discovered by a Whitewood Street resident who notified the police department.  Crews from the City's Public Works Department, including utility maintenance, streets and engineering divisions, along with police and fire crews and MDU and Black Hills Energy  crews were on the scene Thursday assessing the situation.

            The sink hole remained active throughout Thursday and into Friday morning with additional episodes of erosion.  Public Works officials utilized depth equipment Friday morning to measure the length and depth of the sink hole and determined the hole was 24 feet (east to west) by 29 feet (north to south) and approximately 31 feet deep.

            Overnight the sink hole expanded slightly, approximately two feet to the north in the boulevard section on the west side of the 300 block of Whitewood Street (the boulevard section is the area between the sidewalk and curb). 

            MDU is putting in a temporary gas line Friday afternoon to restore gas service to a duplex, the only residence impacted with loss of service in the area.  Tech praised the cooperation of crews from the utility companies.

            Traffic remains closed in the vicinity of the sink hole, impacting the 300 block of Whitewood Street and the 2700 and 2800 blocks of West Omaha Street.  The public is reminded to respect the security fencing and boundary perimeter around the sink hole.  City officials also indicate residents near the affected area can expect a larger volume of truck traffic hauling material this weekend and into next week.

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Thank you,

Darrell W. Shoemaker | Communications Coordinator

T: 605.721.6686 | M: 605.939.8551

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W: www.rcgov.org

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