06/08/2010 02:33 pm ET Updated May 25, 2011

Boulder Bridge Collapses As Rivers Swell (VIDEO)

LANDER, Wyo. (AP) -- Rain and a spring heat wave that is quickly melting mountain snowpack have sent rivers rising in west-central Wyoming to record or near-record levels, washing out small bridges and flooding some homes. No casualties have been reported.

About 100 members of the Wyoming National Guard have been deployed to evacuate people and help bag sand in Fremont County, which Gov. Dave Freudenthal has declared a disaster area. Some 86,000 sandbags have been distributed and another 220,000 are on order.

Minor flooding also is occurring Tuesday in northwest and south-central Wyoming.

People also were keeping a nervous eye on rising rivers in Colorado, where the high water prompted some rafting companies to halt guided trips. An Aspen man rafting in the swollen Eagle River drowned over the weekend.

WATCH footage of a bridge in Boulder Canyon that washed out Tuesday morning thanks to high river waters.