This mark is located on the bridge across the Firehole River. The cap is located at the northeast end of the bridge in the north sidewalk about 16 feet north of highway centerline. The cap was set by the National Park Service in 1976 and was marked A.
NGS PID PY0781 - (
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DESCRIBED BY NATIONAL GEODETIC SURVEY 1987 25.7 KM (15.95 MI) WEST FROM WEST THUMB. 25.7 KM (15.95 MI) WESTERLY ALONG THE MADISON JUNCTION-WEST THUMB HIGHWAY FROM ITS SOUTH JUNCTION WITH THE WEST THUMB-LAKE JUNCTION HIGHWAY IN WEST THUMB, IN THE SOUTHEAST CORNER OF THE NORTH WALKWAY OF A HIGHWAY BRIDGE SPANNING THE FIREHOLE RIVER, AND 5.0 M (16.4 FT) NORTHWEST OF THE CENTERLINE OF THE HIGHWAY. THE MARK IS 0.3 M ABOVE THE HIGHWAY.