Design Resources
- County Bridge Standards. Standard bridge plans are designed for use by local agencies.
- Culvert Standards. Standard culvert designs for use by the Iowa DOT and local agencies.
- Preliminary Design Software. The Iowa DOT has a Culvert Program as well as a Bridge Backwater Program that is free to download for use by Local Public Agencies and Consultants at this link.
National Bridge Inventory β NBI and SNBI
- Guidance β SNBI Initial Data Entry (188.02 KB) .pdf
- Guidance β LPA Bridge Inspection Submittal Timeline & SNBI Transition (135.43 KB) .pdf
- Recording and Coding Guide for the Structure Inventory and Appraisal of the Nation's Bridges
- NEW! - Specifications for the National Bridge Inventory (SNBI)
- Guidance β Load Ratings for NBIS and SNBI Compliance (92.63 KB) .pdf
- Summary of Recent Load Rating Changes (05/24/24) (303.47 KB) .pdf
Additional Resources
- Structural Inventory and Inspection Management System (SIIMS). SIIMS is used by the Iowa DOT, local agencies, and their consultants to enter and review bridge inspection information in order to comply with the National Bridge Inspection Standards (NBIS).
- The Bridge Condition Report found on the Iowa Public Works Service Bureau is an interactive map that examines the condition of municipal bridges in all Iowa Cities, based on the official National Bridge Inventory (NBI) data that is reviewed by FHWA to determine Good/Fair/Poor categories annually.
- Annual Bridge Reports. The Iowa DOT Bridges and Structures Bureau compiles an Annual Bridge Report.
- Bridge Preservation Resources for Local Agencies (185.86 KB) .pdf (185.86 KB).pdf This is a Bridge Preservation guide the Minnesota DOT provides to their LPAs, that may be helpful for Iowa LPAs
- Report - Prioritizing Preservation for Locally Owned Bridges (2.04 MB) .pdf While State Departments of Transportation (DOTs) own and maintain a larger deck area of bridges, local and Federal agencies have almost an equal number of bridges for which they are responsible for maintenance and preservation. This report analyzes how local agency bridge owners prioritize preservation actions for their bridge inventories. The study draws upon the results of a survey of over 500 local agency bridge owners and follow-up interviews with select respondents. The report highlights the project selection processes for bridge preservation activities, including funding sources, and documents typical bridge preservation actions, bridge management practices, successes and challenges to funding preservation, and the status of the agenciesβ bridge preservation programs.
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