| Feature Name: | Alton Twin Lakes South Dam
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| Feature Type: | dam
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| State: | Illinois
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| County: | Madison
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| County Population: | 258941
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| County Housing Units: | 108942
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| County Size: | 725.02 Square Miles
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| Latitude: | 38.945
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| Longitude: | -90.12667
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| Map Cell Name: | Alton
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| Geographic Keywords: | Alton,
Lakes,
Twin
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