In Iowa, United States
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The United States Geological Survey (USGS) is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology, geography, geology, and hydrology. The cache is near a station that monitors hydrology data for the nearby Perry Creek.
(No hints available.)
Last Updated: on 8/3/2015 11:03:38 AM Pacific Daylight Time (6:03 PM GMT)
Coordinates are in the WGS84 datum