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Dewey County, South Dakota
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==Geography== The Moreau River flows east-northeasterly through the upper central parts of Dewey County, discharging into the [[Missouri River]] near the county's NE corner. Smaller drainages move runoff water northward from the central-eastern portions to the Missouri River, discharging near the community of Promise. A significant arm of the Missouri River forms the county's southeastern border. The county terrain consists of rolling hills, sloping southeastward and dropping off into the Missouri River basin.<ref>{{Cite web |url=https://www.daftlogic.com/sandbox-google-maps-find-altitude.htm |title="Find an Altitude" Google Maps (accessed February 2, 2019) |access-date=February 2, 2019 |archive-url=https://web.archive.org/web/20190521043409/https://www.daftlogic.com/sandbox-google-maps-find-altitude.htm |archive-date=May 21, 2019 |url-status=dead}}</ref> The county has a total area of {{convert|2445|sqmi}}, of which {{convert|2302|sqmi}} is land and {{convert|143|sqmi}} (5.8%) is water.<ref>{{cite web|url=http://www2.census.gov/geo/docs/maps-data/data/gazetteer/counties_list_46.txt|publisher=United States Census Bureau|access-date=March 24, 2015|date=August 22, 2012|title=2010 Census Gazetteer Files}}</ref> The eastern portion of South Dakota's counties (48 of 66) observe [[Central Time Zone|Central Time]]; the western counties (18 of 66) observe [[Mountain Time Zone|Mountain Time]]. Dewey County is the easternmost of the SD counties to observe Mountain Time.<ref>{{Cite web |title=Time Zones Map in South Dakota, USA |url=https://www.timebie.com/us/south_dakota.php |access-date=April 27, 2024 |website=Timebie}}</ref> ===Major highways=== {{div col|colwidth=28em}} * [[Image:US 212.svg|23px]] [[U.S. Highway 212]] * [[Image:SD 20.svg|20px]] [[South Dakota Highway 20]] * [[Image:SD 63.svg|20px]] [[South Dakota Highway 63]] * [[Image:SD 65.svg|20px]] [[South Dakota Highway 65]] {{div col end}} ===Adjacent counties=== {{div col|colwidth=28em}} * [[Corson County, South Dakota|Corson County]] β north * [[Walworth County, South Dakota|Walworth County]] β northeast (observes [[Central Time Zone|Central Time]]) * [[Potter County, South Dakota|Potter County]] β east (observes Central Time) * [[Sully County, South Dakota|Sully County]] β southeast (observes Central Time) * [[Stanley County, South Dakota|Stanley County]] β south * [[Ziebach County, South Dakota|Ziebach County]] β west {{div col end}} ===Protected Areas=== * Firesteel Dam State Game Production Area * Isabel Lake State Game Production Area * Little Moreau State Game Production Area * Little Moreau State Recreation Area ===Lakes=== * Lake Isabel * [[Lake Oahe]] (partial) * Little Moreau Lake
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