Arnold Falls, also known as Tsg&E No. 1 1/2, is a hydroelectric dam located in St. Johnsbury, Vermont, along the Passumpsic River. This timber crib dam stands at a height of 21 feet and has a length of 285 feet, with a storage capacity of 170 acre-feet. The dam serves a primary purpose of generating hydroelectric power and is owned by a public utility in Vermont.

Despite being a low hazard potential structure with a "Not Rated" condition assessment, Arnold Falls has not been inspected since May 2000. The dam, which is under state jurisdiction, does not currently have state permitting or inspection requirements. However, with a drainage area of 245 square miles and a surface area of 7 acres, it plays a crucial role in managing water resources in Caledonia County and Vermont.

For water resource and climate enthusiasts, Arnold Falls represents a unique opportunity to explore the intersection of renewable energy generation and dam infrastructure in rural New England. With its location in a picturesque setting along the Passumpsic River and its historical significance in harnessing hydropower, Arnold Falls offers a fascinating case study in sustainable water management practices and the challenges of maintaining aging infrastructure in the face of changing climate conditions.