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name type elevation coordinate USGS map GNIS ID Agency Creek Quarry: Mine: 699 ft (213 m) Niagara Creek: 1137031: Ajax Mine: Mine: 2,356 ft (718 m) Mount Reuben
The Old Portland Underground, better known locally as the Shanghai tunnels, is a group of passages in Portland, Oregon, United States, mainly underneath the Old Town Chinatown neighborhood and connecting to the main business section.
Location by these technical means is necessary because maps often lack the pinpoint precision needed to ensure proper clearance. In older cities, it is especially a problem since maps may be very inaccurate, or may be missing entirely. A few utilities are permanently marked with short posts or bollards, mainly for lines carrying petroleum ...
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A cave survey is a map of all or part of a cave system, which may be produced to meet differing standards of accuracy depending on the cave conditions and equipment available underground. Cave surveying and cartography , i.e. the creation of an accurate, detailed map, is one of the most common technical activities undertaken within a cave and ...
The Robertson Tunnel is a twin-bore light rail tunnel through the Tualatin Mountains west of Portland, Oregon, United States, used by the MAX Blue and Red Lines.The tunnel is 2.9 miles (4.7 kilometers) long [1] and consists of twin 21-foot-diameter (6.4 m) tunnels.
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The movie Twice Under (1987) about a Vietnam veteran "tunnel rat" terrorizing a city was partially shot in the underground portion of Pogue's Run between New York and Washington streets. [16] The underground portion of Pogue's Run is a significant feature in Ben Winters ' 2016 book, Underground Airlines , [ 9 ] and in John Green 's 2017 book ...