Potential flooding scenarios and impacts have been evaluated for the proposed remote-handled low-level waste disposal facility at the Idaho National Laboratory (INL). The facility is being evaluated as an onsite disposal alternative in anticipation of the need for additional disposal capacity brought on by closure of the Radioactive Waste Management Complex. The purpose of the flood assessment is to provide supporting information for use in the facility performance assessment required by Department of Energy Order 435.1, "Radioactive Waste Management," (and the environmental assessment required by the National Environmental Policy Act [42 USC §4321 et seq.]).