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Photos by Jim Nieland > Bat Gates

Dark Hole bat gate, Wind Cave

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Bat gate, Santiam Mine No.1

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Mountain Chief Mine gate, Snake River end of tunnel. The mine is closed to the public for safety reasons and for the protection of Townsend's big-eared bats, that roost in the mine.

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Lower entrance gate, looking out, Oregon Cave

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Exit tunnel, outer gate looking in, Oregon Cave

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110 Entrance gate, Oregon Cave

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Watson Grotto gate, Oregon Cave

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Golden Bear Mine gate under construction

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t Golden Bear Mine gate, completed. In this mine gate, steel bars are spaced 5 3/4 inches apart; narrow enough to keep out people, but wide enough to let bats fly through.

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Goldenbear Mine, cutting gate bars

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Golden Bear Mine portal. This portal created an attractive nuisance along a popular hiking trail. The mine exhibits low oxygen levels, and was gated to prevent injury or death to unsuspecting visitors.

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Antilon Lake tunnel portal. This tunnel was once part of an aquaduct which carried water to Antilon Lake, where it was stored for irrigation. The aquaduct is now defunct, and the tunnel caved at its north end.

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Antilon Lake tunnel bat gate under construction. The tunnel is closed for the protection of roosting bats and public safety.

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Lava River Cave bat gate construction, east entrance.

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Bat Gate on Thunderbolt Cave

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US Forest Service employees preparing to repair a bat gate.