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HISTORIC SITE SHORT FORM (03/20) UTAH OFFICE OF HISTORIC PRESERVATION For Section 106 Review Only (For Standing Structures & Buildings/Architecture) 1 IDENTIFICATION Historic Property Name (if known): I-15 SB Bridge at New Harmony Interchange 106 Project Title: 18217 | I-15; Add SB Lane, MP 38 to MP 43 Address: I-15, New Harmony Interchange Lat/Long (optional): 37.481600 -113.220720 City, County: New Harmony, Washington County Geographical Data (optional): 2 EVALUATION Evaluation (select one) The property is considered Eligible at this time because it is already listed in the National Register of Historic Places, or • is at least 50 years old and retains its historic integrity (minimal alterations to key features), and has potential significance under National Register criteria. ✔ The property is considered Not Eligible for listing on the National Register at this time because it: • is less than 50 years old, or is 50 years or older but there have been major alterations to key features. 3 DOCUMENTATION (check all that apply): ✔ two current photographs (required) site sketch map (optional) other: Research Sources (optional, check all sources consulted, whether useful or not) abstract of title building permit Sanborn Maps tax card & photo ✔ other: Internet Research 4 ARCHITECTURAL DESCRIPTION Date of Construction: c. 1959 No. of Stories: 1 Use Building Style: Bridge Building Type: Select One Original Use: Transportation Wall Material: Concrete Foundation Material: Concrete Current Use: Transportation Additions: ✔ none minor major (describe below) Alterations: ✔ none minor major (describe below) No. of contributing outbuildings and/or structures: 0 No. of non-contributing outbuildings and/or structures: 0 Briefly describe the original building, any major additions or alterations and their dates, and associated outbuildings and structures. Also provide a brief history of the building’s construction and use (if known). Note the Architect/Builder (if known). Use continuation sheets as necessary for additional photos and text. This structure (NBI Number 3D 632) is a concrete-cast-in-place freeway interchange bridge that conveys I-15 over UT Highway 144. Three cylindrical T-beam pylons placed on either side of Highway 144 (six cylindrical T-beam pylons in total) support a concrete bridge deck resting on two narrow concrete abutments and strengthened by six concrete rib girders. The top of the bridge deck is surfaced with asphalt paving. Poured concrete traffic barriers line both sides of the bridge deck. The bridge's concrete elements exhibit large sections of delamination and spalling, efflorecence, etc. 5 HISTORY & SIGNIFICANCE Write a brief history of the property, if known, focusing primarily on the original or principal owners & any significant events or other people (besides owners) associated with it. Use continuation sheets as necessary. This bridge structure represents an early but common example of a US Interstate Highway bridge. No evidence indicates that this bridge represents an important example of bridge design, engineering, or construction or that the bridge possesses a direct and important association with historical events or trends. Consequently, this bridge is not eligible for listing on the National Register of Historic Places. Form completed by: David Amott Date (mo/yr): 09/2025 6 PHOTO UPLOAD Upload your images. Please upload at least one current and clear image. If you have additional documents, such as a site sketch map or project area map (a map for each individual property is not required if the project features multiple properties; just submit one map highlighting all properties in the project area), please submit those as a separate pdf or attach as part of the agency letter.