BOISE -- Highway 16 was closed for about an hour and a half Sunday evening as crews battled a grass fire burning near the road.

Gem County Fire Chief Rick Welch says when firefighters arrived on scene the fire had burned about five acres. By the time they had it contained, the fire had grown to around 50 acres.

Fire crews from Emmett and the Bureau of Land Management assisted in the firefighting effort. Welch says the BLM made some air drops on the fire, which helped them get it knocked down. Crews were still out mopping up this evening.

The cause of the fire is under investigation, but Welch says it started near the highway.

Ada County Sheriff's deputies shut down Highway 16 just after 5 p.m. to allow access for fire crews.

The transportation department sent out a traffic alert stating the closure was at milepost 10, between Chaparral Road and Jackass Gulch Road - Old Freezeout Road. That's about two miles south of Emmett.

Drivers were rerouted in both directions.

Gem County dispatch says the highway was reopened to traffic around 6:50 p.m.

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