STANISLAUS COUNTY (CBS13) – Two teenage girls were seriously injured, one in critical condition, following a collision on Modesto Reservoir on Saturday.

Around 5 p.m., two girls, ages 14 and 15, were riding on a jet ski in the reservoir, when they collided with motor boat and were both injured. The 15-year-old was taken to the hospital where she is listed in critical condition. The 14-year-old suffered broken bones but is expected to recover, according to a statement from Stanislaus County Sheriff’s Department Public Information Officer Josh Clayton.

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The driver of the boat was arrested on suspicion of boating under the influence. The name of the driver has not been released.

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The sheriff department’s major accident investigation team is on the scene of the crash.

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It’s unknown if the boater and the teens knew each other, Clayton says.