Johnson, also known as Twin Creek, is a privately owned irrigation dam located in the Dallas Oil Field in Fremont, Wyoming. Built in 1959 by designer Floyd A Bishop, this earth dam stands at a height of 32 feet and has a storage capacity of 228 acre-feet. With a spillway width of 42 feet and a slide gate for outlet control, Johnson serves the primary purpose of agricultural irrigation for the surrounding area.

Despite being classified as having a low hazard potential and fair condition assessment, Johnson has undergone regular inspections every five years to ensure its safety and functionality. The dam, which is regulated and permitted by the State of Wyoming, is equipped with measures to manage moderate risks associated with its operation. Located in a picturesque setting with a surface area of 17 acres, Johnson plays a crucial role in water resource management in the region.

With Liz Cheney (R) as the Congressional representative for the area, Johnson continues to be an important structure for water distribution and agricultural support. Its presence on Twin Creek contributes to the overall water management system in the region, highlighting the intersection of water resources and climate considerations in sustaining agricultural activities in Wyoming.