Flood­ing dis­as­ter con­tin­ues to hit the US state of Col­orado as rivers over­flowed dam­ag­ing roads and prop­er­ty in the Rocky Moun­tain foothills. Four peo­ple have died since the floods began Wednes­day. Hun­dreds have not been heard from as res­cuers make progress in an area that has many nar­row washed out roads. Ama­teur Radio Emer­gency Ser­vice (ARES) vol­un­teers are in the area pro­vid­ing essen­tial emer­gency com­mu­ni­ca­tion to Red Cross and oth­er oper­a­tion cen­tres. The Boul­der Coun­ty has used air­borne ama­teur tele­vi­sion cam­eras to sur­vey those in need of res­cue and the dam­age. ARRL Col­orado Sec­tion ARES Man­ag­er Jack Ciac­cia WM0G said unmanned drones, both fixed wing and a heli­copter, have been trans­mit­ting ATV video that can be eval­u­at­ed by offi­cials. Boul­der Coun­ty Emer­gency Coor­di­na­tor Al Bish­op K0ARK owns Ref­er­ence Tech­nol­o­gy and the com­pa­ny is pro­vid­ing the drones. It was not the first time res­cuers have used ama­teur radio vision of the scene. For exam­ple, dur­ing the 2009 oil spill clean-up sup­port­ed by the Spe­cial­ist Com­mu­ni­ca­tions Group in Queens­land vision came from a hel­met-mount­ed camera.