FDOT Standard Plans · FY 2026-27 · Series 400: Structures
FDOT Standard Plans Index 400-292: Standard Precast Concrete Box Culverts
Short answer
Index 400-292 is the FDOT Standard Plan for Standard Precast Concrete Box Culverts, part of Series 400 (Structures). The sections below are extracted from FDOT's Standard Plans Instructions (SPI) for this index — design criteria, assumptions and limitations, and what your plans must show.
Design Criteria
Design Criteria AASHTO LRFD Bridge Design Specifications , 4 th Edition; Structures Design Guidelines ( SDG )
Design Assumptions and Limitations
Design Assumptions and Limitations Since these standards were designed based on the 4th Edition of the AASHTO LRFD Bridge Design Specifications , the calculations yield a slightly more conservative design than the 6th Edition for some depth ranges due to the elimination of the Fatigue Limit State check. At the contractor's option, these precast designs may be substituted for cast - in - place box culverts designed to AASHTO LRFD Bridge Design Specifications . Designs are based on the design criteria shown in the SDG .
Use this standard with Index 400 - 291. This index may be used in lieu of Index 400 - 289 when a precast box culvert is determined to be more cost effective or more appropriate for the project. In such cases, the designer shall show the box culvert Span, Rise and Design Earth Cover in the plans.
The designer shall also provide the headwall and wing wall design in the plans by completing the relevant data tables and notes for Index 400 - 289 (Box Culvert Data Tables).
Payment
Payment Item number Item Description Unit Measure 400 - 2 - 1 Concrete Class II, Culverts CY 400 - 4 - 1 Concrete Class IV, Culverts CY 415 - 1 - 1 Reinforcing Steel - Roadway LB
What your plans must show
Plan Content Requirements for this index — the SPI's checklist for designers.
- Include references to and completed data tables for Index 400
- - 289 Concrete Box Culvert Details in the plans. Use of Index 400
- - 292 in lieu of Index 400
- - 289 is at the contractor's option unless specifically excluded by plan note. Show water
- - tight joints in the Contract Plans where required.
How PDFDepth uses this index
When a plan set cites Index 400-292, PDFDepth's AI Plan Review cross-references the set against the Plan Content Requirements for the FDOT indexes it cites and flags items that appear to be missing — each with a citation to the sheet. A human reviewer verifies every flag before it counts.
Related indexes in Series 400
- Index 400-010 — Cantilever Retaining Wall (C - I - P)
- Index 400-011 — Gravity Wall
- Index 400-021 — Concrete Steps
- Index 400-090 — Approach Slabs (Flexible Pavement Approaches)
- Index 400-091 — Approach Slabs ( Rigid Pavement Approaches)
- Index 400-289 — Concrete Box Culvert Details
- Index 400-291 — Precast Concrete Box Culvert Supplemental Details
- Index 400-510 — Composite Elastomeric Bearing Pads - Prestressed Florida - I and AASHTO Type II Beams
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Start for FreeText extracted from FDOT Standard Plans FY 2026-27, a public-domain Florida state publication. Always verify against the current edition at fdot.gov. PDFDepth is not affiliated with FDOT.