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Remaining work at the milelong structure includes “placing soil cement on the crest and downstream slope of the embankment to protect against erosion and failure, if overtopped, and installing graded filter-drainage blankets and trench drains to control seepage.”

The milelong walk takes around 45 minutes to an hour.

Gov. Gavin Newsom declared a state of emergency Saturday to help expedite the work on the milelong section of heavily trafficked freeway, which is a key east-west route through downtown.

The only clue this was a prison was the nearly milelong wall that surrounds it, 20 feet high and curving at the top with an elegance that Scandinavians seem able to put into everything they build, regardless of purpose.

A hush fell over the group as we entered the great banquet hall with its milelong table.