Aggradation at bridges

Peggy Ann Johnson, R. D. Hey, M. W. Horst, A. J. Hess

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Aggradation at bridges causes the bridge waterway opening to be reduced, possibly resulting in upstream flooding and increased contraction scour. Aggradation results when the sediment load supplied to a reach of river from upstream exceeds its capacity to transport sediment. Solutions to aggradational problems at bridges are often complex and expensive. Solutions include increasing sediment transport through the bridge by modifying the channel, constructing an upstream sediment trap, redesigning the bridge, dredging, and treating the cause of the aggradation. At many bridges, aggradation problems can be severe. As an example, aggradation at a bridge in northern Pennsylvania is described. The benefits, disadvantages, and costs for various possible solutions to the example problem are compared and the most cost-effective solution is presented.

Original languageEnglish (US)
Pages (from-to)154-157
Number of pages4
JournalJournal of Hydraulic Engineering
Issue number2
StatePublished - Feb 1 2001

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Water Science and Technology
  • Mechanical Engineering


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