May 18
| 1962 | 18 1962 By a letter to Senator Dennis Chavez, Chairman of the Senate Committee on Public Works, Administrator Rex Whitton transmits a report on The Use of Materials for the Nation's Highways, as requested by a committee resolution on January 16, 1962. The report covers such materials as aluminum, explosives, steel, plywood, bituminous materials, chloride salts, portland cement, rubber products, additives for concrete, electronic and scientific products, and plasticized sulfur pavement markings. | |
| 1980 | Mount St. Helens erupts in Washington State, killing dozens, damaging a large portion of State Route 504, and covering other highways with volcanic ash. | |
| 1984 | Forest Service personnel at the Gifford Pinchot National Forest present an appreciation plaque to FHWA's Western Direct Federal Division for rebuilding access roads to Mount St. Helens National Monument. The Division helped in the $27 million reconstruction of the road system damaged by the 1980 eruption.
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