CX-035183: Lower Monumental-McNary Impairment Remediation Project

Bonneville Power Administration (BPA) proposes to remediate impairments along eight spans of the Lower Monumental-McNary No. 1 500-kilovolt transmission line. An impairment is a location along the transmission line where the distance from the conductor to the ground surface is inadequate, per National Electrical Safety Code (NESC) standards, resulting in a threat to line reliability and posing a risk to public health and safety. The proposed work is necessary to ensure the line meets current NESC and Federal Energy Regulatory Commission (FERC) reliability standards.