A car and motorcycle collided at Savidge and Park streets at about 4:15 p.m.
Shortly after that, a police car headed to the first crash collided with a car farther east on Savidge Street.
Traffic was backed up in both directions on Savidge and Exchange streets after the crashes.
The motorcyclist, 24-year-old Nick Kolosa of Grand Rapids, had spent the day at the Grand Haven beach and was headed home, according to his friends. Kolosa was driving east on Savidge when a car turned left off Park Street onto Savidge and hit the motorcycle.
He was taken by ambulance to North Ottawa Community Hospital where he was treated and released, a hospital official said.
The driver of the car was not injured.
Sgt. Curt Theune of the Spring Lake/Ferrysburg Police Department was driving to the scene of the first crash when his patrol car crashed with a white Dodge Grand Caravan at the intersection of Savidge and Lake streets. Theune was taken to North Ottawa Community Hospital by ambulance with minor injuries, Village Manager Chris Burns said. He was treated and released, a hospital official said Wednesday morning.
The four occupants of the van refused treatment at the scene.
John Hazlett of Spring Lake said his daughter, Kara Hamm, was driving the van.
"We live in Strawberry Point," he said. "She was coming over to visit after she picked up the kids."
Hazlett said two of his grandchildren had slight scratches.
Hamm said she was going to take them to the hospital to be checked.
A witness said the police car was westbound on Savidge with siren and overhead lights on, and all but one car had pulled over on both sides of Savidge. The van was heading north on Lake with a green light and apparently did not see the police car approaching the intersection.
Michelle Allard said she was at a nearby ice cream store when she saw the police car approaching from the east.
"He was going pretty fast. That caught my attention," she said. "He slowed down to go around a car. As he was doing that, the van came through and hit the police car."
Hazlett said his daughter didn't hear the siren. She proceeded with the green light and struck the police car.
The Ottawa County Sheriff's Department is investigating the crash involving the Spring Lake/Ferrysburg police car.