Police closed a number of roads near RAF Waddington after digging work uncovered an 80-year-old mortar.
Tower Lane, Harmston, from the junction for Harmson to the A607 junction, was closed for a number of hours with diversions put in place.
Lincolnshire Police confirmed digging had uncovered what is now understood to be a training device. The Explosive Ordnance Disposal (EOD) were also called to the scene.
It’s not the first time a training mortar has been discovered in the area of the base, particularly during a period of upgrade works on the RAF runway.
An RAF Waddington spokesperson said: “RAF Police received a report of suspected unexploded ordnance this morning. The Explosive Ordnance Disposal (EOD) Unit were called to assess the situation and to dispose of the device.
“A cordon was put in place and Lincolnshire Police initially closed Tower Lane between the A15 and A607. The A15 was not affected at any time. Officers from EOD confirmed that the cordon could be reduced so Lincs Police reopened Tower Lane.
“There was no need to evacuate station personnel and there has been no impact on operations. It was later confirmed that the non-explosive training ordnance was approximately 80 years old.”