FDOT Standard Plans · FY 2026-27 · Series 400: Structures
FDOT Standard Plans Index 400-291: Precast Concrete Box Culvert Supplemental Details
Short answer
Index 400-291 is the FDOT Standard Plan for Precast Concrete Box Culvert Supplemental Details, 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 ; Structures Design Guidelines ( SDG )
Design Assumptions and Limitations
Design Assumptions and Limitations Work this Index with the Cast - In - Place Concrete Box Culvert Details and Data Tables shown in the plans, Indexes 400 - 289 and 400 - 292, and the Precast Concrete Box Culverts shown in the shop drawings.
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.
- Show Differential Settlement (ΔY) and Effective Length (L) for single curvature deflection in the Contract Plans where significant long
- - term settlement is anticipated. See Index 400
- - 291(Sheet 5 of 5) for details. Show water
- - tight joints in the Contract Plans where required.
How PDFDepth uses this index
When a plan set cites Index 400-291, 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 400-292 — Standard Precast Concrete Box Culverts
- 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.