South Unit Loop Road Reconstruction Project

Theodore Roosevelt National Park released an Environmental Assessment to reconstruct approximately 6.15 miles of South Unit Loop Drive.

The Park considered two alternatives: the no-action alternative and one action alternative (proposed action).

1. Under the No-Action Alternative, the approximately 4-mile section of Scenic Loop Drive would remain closed to visitors, erosion would continue to worsen the condition of the roadway, and structural and accessibility issues would remain. This alternative would not relieve the risk of future roadway failures.

2. The proposed action would address multiple roadway problem areas along Scenic Loop Drive by reconstructing approximately 6.15 miles of road for longevity and resilience. The proposed action includes specific treatment options for repairing each section of the road to address existing problems. These treatment options are based on existing data, geological and soil studies, field exploration, survey and mapping of surface features, groundwater and hydraulics analyses, geotechnical back-analysis, and stability analyses. All proposed treatment options would occur within the project area, with possible exceptions for stormwater drainage requirements. This proposed action also includes landslide mitigation and minimization measures, such as stabilization, that would protect natural aesthetics and reduce environmental impacts.

Document Content:

THROSouthUnitLoopRoadReconstructionEnvironmentalAssessment.pdf   (7.8 MB, PDF file) Appendix A - Photo Log of Historic Features.pdf   (5.6 MB, PDF file) Appendix B - NHPA Section 106 Memorandum of Agreement.pdf   (2.1 MB, PDF file) Appendix C - NRCS Soil Suitability.pdf   (954.1 KB, PDF file) Appendix D - Wetlands and Floodplains SOF.pdf   (3.6 MB, PDF file) Newsletter THRO South Unit Loop Remediated.pdf   (8.5 MB, PDF file) Public Mtg Presentation_508.pdf   (11.5 MB, PDF file) 02_2022 04 12_THRO_SULR_FONSI_ERRATA_DONI_MOA.pdf   (3.9 MB, PDF file) 03_2022 03 14_THRO_Appendix D_Wetlands Floodplains SOF.pdf   (3.9 MB, PDF file) MOA Signature Page.pdf   (23.8 KB, PDF file) Disclaimer: Links within the above document(s) were valid as of the date published. Note: Some of the files may be in PDF format and can be viewed using the Adobe Acrobat Reader software. You may download a free copy of from Adobe Systems.