Welling No 2, also known as Welling Big Dam, is a privately owned structure located in Bear Lake, Idaho. This earth dam, constructed in 1962 for irrigation purposes, stands at a height of 28.8 feet with a hydraulic height of 26.3 feet. The dam has a storage capacity of 147 acre-feet and serves the Bear Lake Springs area.

The dam's spillway, which is controlled, and its low hazard potential make it a vital resource for managing water in the region. Despite its satisfactory condition assessment as of August 2013, the dam poses a very high risk due to its location and function. The structure has a drainage area of 0.8 square miles and a storage area of 14 acres, making it a key component in the water management system for the area.

With state regulation, inspection, and enforcement in place, Welling No 2 continues to play a crucial role in supporting irrigation activities in Bear Lake. Its presence ensures the consistent supply of water for agricultural purposes, highlighting the importance of maintaining and monitoring water resources in the face of changing climate conditions.