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Bridges & Structures



Stream Stability at Highway Structures Fourth Edition

This document provides guidelines for identifying stream instability problems at highway stream crossings. It is an update of the third edition published in 2001. The HEC-20 manual covers geomorphic and hydraulic factors that affect stream stability and provides a step-by-step analysis procedure for evaluation of stream stability problems. Stream channel classification, stream reconnaissance techniques, and rapid assessment methods for channel stability are covered in detail. Quantitative techniques for channel stability analysis, including degradation analysis, are provided, and channel restoration concepts are introduced. Significant new material in this edition includes chapters on sediment transport concepts and channel stability in gravel bed streams, as well as expanded coverage of channel restoration concepts.

  • FHWA Publication Number: HIF-12-004
  • Publication Year: 2012

Other documents in this series:


The PDF file(s) can be downloaded at no cost, there are no free copies of the printed materials. However, printed copies are available for purchase at the NHI store: http://www.nhi.fhwa.dot.gov/training/nhistoresearchresults.aspx?topicnum=135 (look for "REFERENCE MANUAL" under the Type column).

PDF files can be viewed with the Acrobat® Reader®
Word files can be viewed with the Word Viewer
Updated: 10/20/2016
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