Unknown Foundations
Principal Documents
Policy
- Additional Guidance for Assessment of Bridges Over Waterways with Unknown Foundations (10/29/2009)
- Revision of Coding Guide, Item 113 - Scour Critical Bridges (04/27/2001)
Guidance
- Guidance on Applying Risk Based, Data Driven Decision-Making Process to the FHWA Scour Program (04/09/2012)
- HEC 18 - Evaluating Scour at Bridges (5th edition) (April, 2012)
- Frequently Asked Questions - Bridges Over Waterways with Unknown Foundations (06/03/2009)
- Compliance with the National Bridge Inspection Standards - Background/Plan of Action for Scour Critical Bridges/Scour Focus States/Item 113 Coding Issues/Unknown Foundations/Tidal Bridges (03/23/2006)
- Compliance with the National Bridge Inspection Standards - Plan of Action for Scour Critical Bridges (03/29/2005)
- Geotechnical Guideline No. 16 - Determination of Unknown Subsurface Bridge Foundations (08/27/1998)
- Evaluating Scour at Bridges (T 5140.23) (10/28/1991)
Publications
- HEC 23 - Bridge Scour and Stream Instability Countermeasures: Experience, Selection, and Design Guidance (3rd edition, Volume 1) (September, 2009)
- HEC 23 - Bridge Scour and Stream Instability Countermeasures: Experience, Selection, and Design Guidance (3rd edition, Volume 2) (September, 2009)
Training & Workshops
WBT = Web-based Training
- 2D Hydraulic Modeling Review Training
- CMIP Tool Webinar
- NHI 135085 - Plan of Action (POA) for Scour Critical Bridges (WBT)
- All training