U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590

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Bridges & Structures



The FHWA software available at this site is in the public domain and is available for downloading as zipped files or self-extracting zipped files. This software may be downloaded and used without restriction.

By downloading the software, the user accepts responsibility for understanding the following conditions and limitations, and agrees to them:

  • The FHWA does not provide user assistance or support for this software.
  • The application of this software is the responsibility of the user. It is imperative that the responsible engineer understands the potential accuracy limitations of the program results, independently cross checks those results with other methods, and examines the reasonableness of the results with engineering knowledge and experience.
  • There are no expressed or implied warranties.

Links to software produced by others (HEC-RAS, WMS, and SMS) are also provided below.

FHWA Hydraulic Engineering Software
Application Software and Tools Date Contact
Culvert Hydraulic Analysis & Design HY 8 Culvert Hydraulic Analysis Program

Companion Resource:
2022 David Claman
Hydrologic Analysis (Rational method, Regression Equations, TR-55, TR-20, HEC-HMS)
Basin Delineation
Storm Drain Analysis & Pump Station Design (HY 12)
HEC-RAS Model Development
Watershed Modeling System (WMS)*

Companion Resources:
2016 Megan Frye
Bridge Scour Assessment and Summary
Riprap Analysis
Channel Lining Design
Rock / Sediment Gradation Analysis
Curb and Gutter / Inlet Analysis
Detention Basin Analysis
Rational Method Hydrologic Analysis
Channel and Weir Analysis
Hydraulic Toolbox

Companion Resources:
2022 Ryan Lizewski
Two-Dimensional Hydraulic Analysis Surface-Water Modeling System (SMS)*

Companion Resources:
2021 Scott Hogan
One-Dimensional Hydraulic Analysis Hydrologic Engineering Center’s River Analysis System (HEC-RAS)

Companion Resources:
2016 Laura Girard
Climate Adaptation 2016
Mike Culp
Rob Kafalenos
Daniel Sharar-Salgado

* Through an arrangement between FHWA and Aquaveo, free WMS and SMS licenses are provided to state DOT and FHWA employees. Please refer to the licensing instructions (found under "Companion Resources" in the table above), for additional details and directions on downloading and registering these software programs.

Updated: 11/10/2022
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000