A single-vehicle crash in the 16400 block of McGuire Road in unincorporated Harvard left a woman seriously injured Wednesday afternoon, authorities said. | Photo: HFPD

A postal worker was transported to a trauma center after suffering life-threatening injuries when she crashed her mail truck into a tree near Harvard, fire officials said.

The Harvard Fire Protection District and McHenry County Sheriff’s Office responded around 3:50 p.m. Wednesday to the 16400 block of McGuire Road in unincorporated Harvard.

Harvard Fire Protection District spokesperson Alex Vucha said firefighters received a call for a motor vehicle crash with injuries.

The 911 caller reported a U.S. Postal Service truck was involved and the driver was unconscious.

One of Mercyhealth’s emergency field vehicles — called MD-1 — was called to the scene to assist with medical care.

A single-vehicle crash in the 16400 block of McGuire Road in unincorporated Harvard left a woman seriously injured Wednesday afternoon, authorities said. | Photo: HFPD

MD-1 vehicles are staffed by residency-trained emergency medicine physicians and they can help paramedics stabilize a patient before they are transported to the hospital from a scene.

A REACT helicopter was placed on standby but declined to fly due to inclement weather in the area, Vucha said.

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Fire crews arrived to find a U.S. Postal Service vehicle that had driven off the roadway and crashed into a tree.

McHenry County Sheriff’s Deputy Kevin Byrnes said the truck had been traveling eastbound on McGuire Road west of Wilson Road.

The truck left the roadway for unknown reasons and crashed into the tree, Byrnes said.

A single-vehicle crash in the 16400 block of McGuire Road in unincorporated Harvard left a woman seriously injured Wednesday afternoon, authorities said. | Photo: HFPD

The truck had heavy front-end damage, Vucha said. No other vehicles were involved in the incident.

The female driver of the postal truck was alert but seriously injured.

She was transported by ambulance to Javon Bea Hospital—Riverside in Rockford with serious, life-threatening injuries, Vucha said.

However, Byrnes said the woman suffered non-life-threatening injuries.

The McHenry County Sheriff’s Office is investigating the cause of the crash. No citations have been issued.