State Historic Bridge Inventory and Evaluation (2024 Update)

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STATE HISTORIC BRIDGE INVENTORY AND EVALUATION 2024 UPDATE Previous County surveys were each completed by a different consultant to HDOT and utilized a different rating system, which resulted in apparent inconsistencies. For example, only 3%of Maui County bridges were placed in Category I, while the Kauai inventory included 31%of its bridges in Category I. Criteria were revised for improved consistency, and the bridges were reevaluated within a statewide historical context in the draft 2008 inventory and utilized new statewide criteria. 2013 SHBIE REPORT Upon request from the HDOT and in response to the ACHP's Program Comment regarding post-1945 bridges, the 2013 SHBIE utilized and revised information provided in the draft 2008 report to reflect a more detailed current analysis of historic bridges in Hawaii. From the draft 2008 report, approximately 550 additional bridges were added to the overall inventory to include County-owned bridges and bridges built prior to 1968. Community members were asked for their input to help identify bridges that may have historical significance, and they provided valuable insight into the final selection of bridges determined to be eligible and of"high preservation value." The 2013 SHBIE included individual inventory forms for each bridge as well as a bridge list that categorized 707 bridges and identified each bridge's NRHP status. The list includes a brief description of character-defining features (if any)for each bridge. Historic status of the bridges were organized into five categories: • Eligible—High Preservation Value: Bridges within this category included those that were identified as generally unique or possessed characteristics of a type and exhibited high degrees of historic integrity. These were recommended for listing in the HRHP or NRHP. The 2013 SHBIE identified 208 of 707 bridges as "High Preservation Value." • Eligible: Bridges which under this category included those that were not the best example of a type and were not unique. The report recommended HDOT consider maintaining bridges in this category, as through attrition, these may become rare examples of a type at some point in time. The 2013 SHBIE identified 176 of 707 bridges as NRHP-eligible. • Not Eligible: Bridges considered not eligible for listing included those that had lost considerable historic integrity or did not exhibit any qualities that conveyed historic significance. The 2013 SHBIE identified 94 of 707 bridges as not eligible. • Non-Contributing:Several bridges were identified as non-contributing, which were bridges within a historic district that did not contribute to the significance of the historic district, either by lack of historic integrity or construction outside of the historic district's period of significance, for example. The 2013 SHBIE identified 10 of 707 bridges as non-contributing;these bridges received individual forms. • Program Comments: Post-1945 bridges of common construction methods and materials, as well as bridges associated with the interstate highway, fell under the Program Comments designation. The 2013 SHBIE identified 219 of 707 bridges in this category.