end with some dangerously cold temperatures... we begin with chief the army corp of engineers wants you to avoid what little ice there is on saylorville lake... the corp issued the warning this morning... at this point... there is only ice around the edges of the lake. the corp is lowering the lake level.. and says that will make the ice unsafe once it freezes over. are getting ready to help those who ignore ice warnings... this is video of the cedar rapids rescue team practicing today. really dont notice how cold the water is.... frequently change from spot to spot in des moines the parks are rec department flies a green flag at area lakes when the ice is safe. altoona police say a rescue wasn't an option when they arrived at a trench collapse this afternoon... 174114 - intially it came out as a rescue but once we got on scene we could tell by visual cues that this was gonna turn into a recover 30-year old justin jorgensen was installing sewer lines when the roughly 12-foot trench collapsed around. crews worked for several hours to recover his body. according to osha regulations...