Three years sounds good for me. Highway 34 in Colorado has taken over 5 years to fix 27 miles at a cost of over $330,000,000.
“Highway 34 in Colorado has taken over 5 years to fix 27 miles at a cost of over $330,000,000”
most here won’t know that US 34 runs along at river-level in a VERY narrow, steep canyon and has been repeatedly washed out by flash floods. Prior to this, repairs were band-aid fixes.
This time the highway was bot “fixed”, but rebuilt from scratch moving it high up onto the canyon walls out of reach of flooding, necessitating continuous rock drilling and blasting and moving an enormous amount of blasted hard rock. This has necessitated shutting the entire highway down for most of the time, except that every summer construction was halted and the highway opened for tourist traffic because US 34 is one of two major highways that access Rocky Mountain Park from the eastern side ... rebuilding this mountain highway was a massive, massive construction endeavor ...
furthermore, construction took 2.5 years, not 5, and was completed on time ...
https://www.codot.gov/projects/floodrelatedprojects/us-34-big-thompson-canyon-1
https://www.google.com/search?q=us+34+construction+project+budget