Use extreme caution and good judgment to carefully evaluate site conditions including ice strength. Do not continue if the risk is too great. Discussions with senior field personnel who work on ice-covered rivers indicate that many have broken through the ice into deep water at least once in their career. Do not underestimate the hazards associated with working on ice-covered rivers. Do not attempt an ice measurement if there is any doubt that the ice will support the weight of the workers and equipment.
Appropriate clothing is required as protection against hypothermia.
Information on protection against hypothermia is available on the WRD Safety Home Page. One of the two employees present at an ice measurement must be experienced in working on ice-covered rivers. A cell phone, satellite phone or two-way radio is recommended for working at remote sites. The JHA will identify, for each job step, the potential hazards and recommended procedures to be followed. The conditions, if any, for which the wearing of a PFD is not required.