| Feature Name: | Alto Pass Reservoir Dam
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| Feature Type: | dam
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| State: | Illinois
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| County: | Union
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| County Population: | 18293
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| County Housing Units: | 7894
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| County Size: | 416.16 Square Miles
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| Latitude: | 37.58
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| Longitude: | -89.30833
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| Map Cell Name: | Cobden
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| Geographic Keywords: | Alto,
Pass
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