The government mapper's decision to omit the suspended cable from the map was sufficiently site-specific and informed by policy considerations to fall within the discretionary exception to the Act's waver of sovereign immunity; there is no exception to this exception in matters of public safety.
http://cdn.ca9.uscourts.gov/datastore/opinions/2018/07/13/17-15215.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.