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Page 2 of 5 Reference: Brian Drive, Culvert Bridge 02J04 Posting Analysis compared it to the minimum grade raises needed for both bituminous and concrete pavement sections to remove the load posting. A third option would be to rehabilitate the existing culvert with steel plate liners, while a fourth option would be a complete replacement of the bridge. A description of the four (4) options and anticipated load ratings is presented below and in Table 1 on the following page. Existing - Bituminous Pavement: The existing section was analyzed assuming a 1Ó-9Ñ roadway section, including 6Ñ of bituminous pavement and 1Ó-3Ñ of aggregate fill per the current bridge inspection report. Option 1 - Bituminous Pavement with Grade Raise: This option would require increasing the depth of cover over the culvert by 10Ñ, to approximately 2Ó-7Ñ, including 6Ñ of asphalt and 2Ó-1Ñ of aggregate fill. This would increase the roadway profile by a minimum of 10Ñ. Given the relatively low elevations of the adjacent properties in relation to the road, this option would require significant grading within the adjacent yards, as well as storm sewer modifications to ensure drainage can be directed away from the homes. Option 2 - Concrete Pavement with Grade Raise: This option would require increasing the depth of cover over the culvert by 4Ñ, to approximately a 2Ó-1Ñ, including 8Ñ of concrete pavement and 1Ó-5Ñ of aggregate fill. This would increase the roadway profile by a minimum of 4Ñ. Despite a smaller required increase in elevation, this option would also require significant grading within the adjacent yards, as well as storm sewer modifications to ensure drainage can be directed away from the homes. Option 3 Î Structural Liner: This option does not necessitate any changes to the current roadway. Instead, a structural plate liner would be installed inside the existing culverts. While this liner would enhance the structural capacity, it may decrease the hydraulic capacity of the structures. The use of a structural plate liner requires thorough analysis by a qualified supplier, such as Contech. A site visit would be needed to take measurements and assess the suitability of this repair option. The 2024 bridge inspection report indicates distortion in the south culvert, which could limit the feasibility of this repair method for that structure. Option 4 Î Bridge Replacement: This option would entail full replacement of the existing bridge, likely with a concrete box culvert. Given the condition of the culvert and the funding options, this may be the best option to resolve the deficient load rating and resultant load posting. In discussions with MnDOT, they typically see full replacement required in culverts of similar age and condition, and recommend this option. 65