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mayflies shutdown bridge savanna sabula iowa duplicate 2_00002417
mayflies shutdown bridge savanna sabula iowa duplicate 2_00002417

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    See massive mayfly swarm shutdown bridge

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See massive mayfly swarm shutdown bridge

Emergency crews had to use a snow plow to clear the thick piles of mayflies that temporarily shut down a bridge in Iowa. CNN affiliate WQAD reports.

See massive mayfly swarm shutdown bridge

Emergency crews had to use a snow plow to clear the thick piles of mayflies that temporarily shut down a bridge in Iowa. CNN affiliate WQAD reports.