Update: Semi Removed, Lanes Reopen After Chemical Spill Near Bon - NBC Right Now/KNDO/KNDU Tri-Cities, Yakima, WA |

Update: Semi Removed, Lanes Reopen After Chemical Spill Near Bonner

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UPDATE:The semi has been removed from MT 200 and both lanes are back open.

UPDATE: The Blackfoot and Clark Fork Rivers near Missoula are now reopen after health officials determined that the chemicals spilled from a semi truck roll-over into the Blackfoot River east of Bonner this morning are highly diluted and not hazardous.

Montana Fish, Wildlife & Parks closed a 23-mile stretch of the Clark Fork and 13-mile stretch of the Blackfoot earlier today while crews assessed the spill and determined if there was any public safety concerns. Officials found that the amount of chemical spilled was small enough that it quickly dispersed and diluted.

Emergency officials, including health department personnel and hazmat, are trying to contain and clean up industrial-grade chemicals a rolled over semi was carrying on Highway 200.

They say a large amount of the substance is in the Blackfoot River, but it is unknown how hazardous it is. The truck was carrying Aluminum Sulfate and Diethanolamine, which are used to cure cement.

The Blackfoot River is closed from Johnsrud to the confluence and the Clark Fork is closed from the confluence to Kona Bridge until further notice. FWP is stopping boats to prevent them from going through the contaminated areas.

Montana Highway Patrol troopers say the semi tipped due to speed on Hwy 200 approximately 4 miles from the junction with I-90 at Bonner.

Montana Dept. of Transportation officials say traffic is being flagged through a single lane while the accident is being cleaned up.

ABC FOX Montana has a crew on scene and will have more as it develops.