Blackwater Natural Bridge
The trail also leads past the site of the Blackwater fire of 1937 where 15 firefighters were killed and another 38 injured , and is the worst loss of life of firefighters in the history of Wyoming and one of the worst in U . S . 
<triplet> Blackwater fire of 1937 <subj> 15 <obj> number of deaths <subj> 38 <obj> number of injured