| Feature Name: | Thunderhead Falls Tunnel
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| Feature Type: | tunnel
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| State: | South Dakota
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| County: | Pennington
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| County Population: | 88565
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| County Housing Units: | 37249
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| County Size: | 2776.15 Square Miles
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| Latitude: | 44.05833
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| Longitude: | -103.41306
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| Map Cell Name: | Pactola Dam
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| Geographic Keywords: | Falls,
Thunderhead,
Tunnel
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