Develop a plan for each bridge site for placing traffic control devices. When working on ice, there is no substitute for experience. When possible, work with someone who is experienced working on ice. Be aware of the temperature, whether the stage is rising or falling, and whether the ice is strong enough to support your body and equipment. Water is a carrier for many disease-producing organisms.
Appearance alone is no way to judge the safety of the water.
Water-born hazards may come from material dissolved in the water, suspended in the water, or in sediment of the stream bottom. Infections or disease can enter the body through accidental ingestion by mouth or through skin broken by injury or another infection. Wear rubber gloves to avoid contact with water, especially if it is suspected of being contaminated. Obtain immunizations for known hazards. Equipment for each personnel should include separate supplies of drinking water, wash water, soap, and a disinfectant.