More than $25,000 in copper wire was stolen from an Elmore County construction site near Interstate 84 over the weekend.
Western Construction is offering a $5,000 reward for information that leads to the arrest of the thief or thieves.
Employees discovered the missing industrial cable early Monday at the site near exit 129 on the freeway by the town of King Hill.
The stolen wire was used to run heavy equipment. Replacing it and repairing damage to the equipment is expected to cost $50,000.
Elmore County sheriff's deputies are asking for the public's help with possible sightings of the thieves.
"With the closing of deer season it is possible that a hunter may have encountered a truck pulling a trailer or observed a truck with a large amount of black wire," according to a news release.
Thieves often target copper wire to sell at metal scrap yards for cash.
Anyone with information is asked to call Deputy Daniel Parlin at 208-573-5946.