East Aldrich Subwatershed B-6603 in Danbury, Iowa, is a critical water resource managed by the USDA NRCS, with a dam completed in 1954 primarily for fire protection, stock, and small fish pond purposes. This earth dam stands at 35 feet in height, providing a storage capacity of 138 acre-feet and covering an 8-acre surface area. Despite its low hazard potential, the subwatershed is regulated and permitted by the Iowa DNR, ensuring regular inspections and enforcement to maintain its structural integrity.

Located in Ida County, the subwatershed's Aldrich Creek tributary plays a vital role in flood risk reduction for the surrounding area. With a drainage area of 0.73 square miles, the dam controls the flow of water and manages the risk of inundation, contributing to a moderate risk assessment score of 3. Although the condition assessment is currently not rated, the subwatershed's management measures and emergency protocols are in place to address any potential issues and ensure the safety of the community.

As part of the Rock Island District, East Aldrich Subwatershed B-6603 serves as a prime example of sustainable water resource management in the region. With its strategic design by the Natural Resources Conservation Service and state-regulated operations, the subwatershed showcases a collaborative effort to protect the environment, support local agriculture, and mitigate the impacts of climate change on water resources.