Supplemental Supporting Information for a Finding of Effect Project: Kingfield 23048.00; MHPC #1853-17 Scope: Bridge Wearing Surface Replacement Finding of Effect: No Adverse Effect Purpose and Need The purpose of the project is to slow deterioration of elements of Centennial Bridge #5852, eligible for listing in the National Register of Historic Places, until a more comprehensive project is developed. The need is due to the poor condition of the bridge wearing surface, including heavy cracking, which allows water to infiltrate the structure. Proposed Action The proposed action is to remove 2-3” of deck concrete and substrate (if necessary) and then fill all cracks and joints. The repaired cracks would be covered by a high-performance membrane and polymer wearing surface. Those elements would be flashed to the extant curb to prevent water penetration. The existing hot mix asphalt approaches would also be milled and re-paved 30’-50’ from each abutment. Finally, a silane waterproofing agent would be applied to the sidewalks, curb, and retaining walls on both ends of the bridge. Federal Action Federal funding. Definition of Area of Potential Effect (APE) The proposed project is located in the Town of Kingfield. A map is attached below that shows the project APE.

Figure 1. Kingfield 23048.00 Area of Potential Effect

Supplemental Information for a Finding of Effect Kingfield Bridge Wearing Surface

3 MaineDOT WIN 23048.00

Historic Properties1 The proposed project is in Kingfield. There are two historic properties in the APE. The following descriptions are based on Maine Historic Preservation Commission survey forms. Centennial Bridge #5852 National Register-Eligible, Criteria A & C Contributing Resource, National Register-Eligible Kingfield Historic District The Centennial Bridge #5852 is a 176’ concrete arch carrying State Route 16 over the Carrabassett River. It has an elliptical deck with plain spandrel walls. Its original concrete balustrades were replaced by tubular metal rails in 1961. It is the only known ribbed closed spandrel arched in the state. The period of significance is 1916. Kingfield Historic District National Register-Eligible, Criteria A & C The Kingfield Historic District is a large district comprised of residential, commercial, and industrial structures. It is mostly located on the southern banks of the Carrabassett River; however, a residential portion is located on the northeast side of the Centennial Bridge.2 The Kingfield Historic District is eligible for its local significance in Community Planning Development, Social History, Architecture, Commerce, and Industry. The period of significance for this district is circa 1820 through circa 1930, marking the start of increased development through the economic turn down. With few intrusions that originate from after 1930 and a high level of historic fabric, the district retains integrity of all aspects. Archeological Resources There are no archaeological resources in the project area. Impacts to Property The following addresses potential impacts to properties as a result of the proposed action. Centennial Bridge #5852 National Register Listed, Criteria A & C Contributing Resource, National Register-Eligible Kingfield Historic District Wearing surface replacement is largely considered a maintenance project. The proposed wearing surface replacement would be done in-kind and, therefore, would not alter the characteristics of the bridge in a way that would diminish any aspect of integrity. The coating applied to the bridge at the end of the effort would be clear and would not affect the bridge’s integrity. 1 The Preliminary Design Report and Plan Set do not contain stationing on the plans; therefore, no stationing is included in this document. 2 The Kingfield Historic District wholly encompasses the Kingfield Commercial Historic District. The Kingfield Commercial District, while directly adjacent to the bridge, is no longer in the APE because the scope of work for this project has changed since the architectural survey.

Supplemental Information for a Finding of Effect Kingfield Bridge Wearing Surface

4 MaineDOT WIN 23048.00

Kingfield Historic District National Register eligible, Criteria A & C Wearing surface replacement is largely considered a maintenance project and would be done in-kind and, therefore, would not alter the characteristics of the bridge in a way that would diminish any aspect of integrity and its contributing status to the historic district. None of the proposed actions would alter the historic district’s seven aspects of integrity. No right-of-way acquisitions would be required. Archeological Resources There are no archaeological resources in the project area. Avoidance and Minimization Efforts The MaineDOT has sought to avoided effects at this time by taking a minimally invasive approach to slow deterioration while a long-term solution is developed for this crossing. Minimization of harm also includes replacement in-kind of materials, including concrete and hot mix asphalt. Dismissed Alternatives No Build The No Build alternative does not take any action and does not meet

the purpose and need of the project and was therefore removed from further consideration.

Proposed Materials Hot mix asphalt, concrete, polymer. Plans Preliminary Design Report, Centennial Bridge #5852 carrying Route 16 over Carrabassett River, Kingfield, September 12, 2018 Attachments Art Spiess, MHPC, to Julie Senk, MaineDOT, January 3, 2018. Kirk Mohney, MHPC, to Julie Senk, MaineDOT, Concur, May 17, 2018