PA State Archives Hours, Directions, & Fees Research Topics Finding Aids for Collections Land Records

 

 

 


Manuscript Group 496
UNITED STATES GEOLOGICAL SURVEY (USGS)
BRIDGE SURVEY VIDEO COLLECTION
1993-2002
11 cubic feet


The United States Geological Survey (USGS) Bridge Survey Collection contains 689, 8mm HI-8 video tape cartridges of the 12,604 roadway bridges greater than twenty feet in length spanning rivers and streams in the eleven Pennsylvania Department of Transportation (PennDOT) Districts. The tapes contain the original unedited footage of video and audio data collected for the USGS/PennDOT Bridge Scour Assessment Project. The video contains images of the stream channel upstream and downstream of the bridge, floodplains adjacent to the channel at the bridge including both structures and natural features, and the bridge structure itself, including abutments, wing walls, deck, piers, and other features relevant to the assessment of hydraulic characteristics and scour. PennDOT hired USGS to survey and inspect all Pennsylvania bridges from 1992-2002. Included is an index CD-ROM to all of the bridges surveyed and a paper copy of the indexes for each PennDOT district together with cross referencing to the video-tape cartridge number. The universal identifier for the bridges is the fourteen-digit PennDOT bridge identification number. This consists of a two-digit prefix representing the numerical county code, a four digit state route number or roadway number code, a four-digit segment number for the bridge location on the roadway, and a four-digit suffix that represents the distance in feet into the roadway segment.



PA State Archives Hours, Directions, & Fees Research Topics Finding Aids for Collections Land Records