H&H Report Sample Format

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  • Bridge No.
  • P6 ID
  • Contract No.
  • Federal Aid No.
  • Contract Title
  • Report Prepared By:
  • Signature and Seal of Professional Engineer Responsible for the H&H Report with Date of Report Approval


    1. Objective
    2. General Description of Bridge Project and Surrounding Area
    3. Roadway Classification and Design Frequency
    4. General Description of Existing Bridge/Culvert Characteristics
    5. General Description of Proposed Bridge/Culvert Characteristics (Include Bridge / Culvert Characteristics Table)
    6. Flood (FEMA) Zone and History (high-water marks, dates, debris, overtopping, source of data)
    7. Stream and Stream Bed Characteristics (Erosion, Scour, etc.)
    8. Reference Datum
    9. Upstream Conditions (building structures, dams, major tributaries, flood control structures)
    1. Objective
    2. Drainage Area
    3. Hydrologic Computation Methodologies
    4. Hydrologic Summary Table Design Event Discharge (Include FEMA Flows)
    5. Flood Frequency Curve
    1. Objective
    2. Hydraulic Analysis Methodology
    3. Cross Section Data
    4. Boundary Conditions
    5. Manning’s Roughness Coefficients
    6. Energy Loss Coefficients
    7. Structure Modeling
      1. Modeling of Existing Structure and Roadway
      2. Modeling of Proposed Structure and Roadway
    8. Results including Summary Table of Existing v. Proposed Conditions Water Surface Elevations (WSE), Difference and Velocities (Design Event, 100-Year Event)
    9. A summary of results from 2-D modeling (if warranted)
    10. Temporary Conditions
  4. SCOUR ANALYSIS (Box culverts and rigid frames less than 25 feet span do not require a scour analysis, but scour countermeasures need to be provided at the inlet and outlet).
    1. Scour event
    2. Scour Analysis and Calculation Summary
    3. Countermeasures and Calculation Summary
  5. TIDAL INFLUENCES (if warranted)
  6. RISK ASSESSMENT (if warranted)



  1. H&H Report Hydraulic Data Summary Sheet (Appendix 104-3)
  2. Supplemental maps (Location Map, Drainage Area Map (StreamStats), Aerial Photographs, Soils Maps, FEMA FIRM, etc.)
  3. Site Photographs (Both approaches, looking downstream and upstream at structure, looking downstream and upstream from structures, opening(s)
  4. Hydraulic Field Assessment Checklist (Appendix 104-1)
  5. Design Drawings (HEC-RAS cross section locations, bridge design, plan and profile, E&S, existing and proposed 100-Year Floodplain, Scour protection, etc.)
  6. Hydrologic Calculations
  7. Hydraulic Calculations
  8. Digital HEC-RAS files
  9. Printed Existing and Proposed HEC-RAS Summary Table
  10. HEC-RAS cross sections plotted six (6) per page with the above event water surface elevations for existing, proposed and temporary conditions.
  11. HEC-RAS Plot of Existing versus Proposed Water Surface for:
    1. Design event
    2. 100-year event
    3. Scour Design Event
  12. Temporary Conditions Drawings and Calculations
  13. Scour and Channel Protection (Riprap Sizing, Countermeasures) Calculations