Three Sheriff's boats have sunk in Lake Tahoe this summer

Authorities are looking into why a second boat used by the Washoe County Sheriff's Department sank off the shore near Incline Village Thursday.

The 15 year old boat, Marine 10, was brought to Lake Tahoe from it's normal home in Pyramid Lake because it's predecessor, Marine 20, sank off shore in late May.

Normally, Marine 10 is hooked to a trailer at night but was tied to a buoy instead due to the trailer undergoing maintenance.

Both incidents are under investigation.

Last month, a Douglas County Sheriff's boat sunk near Zephyr Cove. In that case, the boat was old and had been repaired numerous times. According to DSCO, the hull had structural deficiencies. A new boat is being purchased and delivered near the beginning of 2015. In the meantime they are using a boat from Nevada Department of Wildlife.