Clearwater is a city located in Pinellas County, Florida, US, nearly due west of Tampa and northwest of St. Petersburg. As of the 2000 census, the city had a total population of 108,787. It is the county seat of Pinellas County. Clearwater is the smallest of the three principal cities in the Tampa-St. Petersburg-Clearwater metropolitan area, most commonly referred to as the Tampa Bay Area. Present-day Clearwater was originally the home of the Tocobaga people. Around 1835, the United States Army began construction of Fort Harrison, named after William Henry Harrison, as an outpost during the Seminole Wars. The fort was located on a bluff overlooking Clearwater Harbor, which later became part of an early 20th century residential development called Harbor Oaks. University of South Florida archaeologists excavated the site in 1977 after Alfred C. Wyllie discovered an underground ammunition bunker while digging a swimming pool on his estate.