A motorcycle crashed into a marsh north of Brown Street and Farmhill Circle in Wauconda Thursday afternoon, leaving the driver with critical injuries. | Photo: Google Street View.

A motorcyclist is in critical condition after he crashed while fleeing police at over 100 mph in a Wauconda neighborhood Thursday, authorities said.

Wauconda Police Department Sgt. Heather Cognac said a Wauconda police officer observed a sport motorcycle with no registration around 4:40 p.m. Thursday.

The officer attempted to conduct a traffic stop on the motorcycle northbound on Brown Street at Slocum Lake Road.

Cognac said the male white driver accelerated quickly and continued northbound on Brown Street through a residential neighborhood at a speed estimated to be over 100 mph.

Within ten seconds, the officer turned off his emergency lights and sirens and began patrolling the neighborhood where the motorcycle was last seen, Cognac said.

Moments later, dispatchers received a 911 call from a resident in the 500 block of Farmhill Circle reporting a motorcycle crash.

Officers arrived and located the driver and motorcycle in a marsh area north of Brown Street and Farmhill Circle.

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The driver was located face down and unconscious in the water near the motorcycle, Cognac said.

Officers pulled the male from the water and began CPR immediately. Paramedics arrived a short time later and continued lifesaving efforts.

The male driver, identified as 26-year-old Kenneth M. Farrar, of the 27000 block of Route 176 in Wauconda, was transported to Advocate Condell Medical Center in Libertyville in critical condition.

The investigation is being handled by the Lake County Major Crash Assistance Team (MCAT). The Island Lake Police Department and Lake County Sheriff’s Office also provided assistance at the scene.