Built in 1901, the Willis Avenue Bridge over the Harlem River carries more than 70,000 vehicles a day. Age, weather and heavy use of this swing bridge led the New
The use and installation of hollow bar soil nails in soil-stabilizing applications has been increasing since their introduction to the United States market more than 15 years ago.
The USGS conducts research and assessments of the undiscovered, technically recoverable oil and gas resources of the United States. Advances in drilling technologies and subsurface geophysical imaging techniques over the last 20 years have enabled a new class of petroleum systems.