Remember those headcuts in Aurora Canyon? We've been working on some of the smaller ones, simply filling them with rock or concocting more intricate structures with erosion cloth and logs. The idea is that the structures will both slow the water down and collect sediment to bring the level of the drainage back up.
 log check dams over cloth |  filling with rock |
Another project we're working on is an abandoned mine closure at a mine where Townsend's big-eared bats (Corynorhinus townsendii) hibernate. Some features will receive bat-compatible gates while others will be permanently closed. We need to get the work done before the hibernating bats arrive to prevent disturbing them.
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| This adit held the powder magazine. The bat gate will be behind the door to preserve the historic feel of the site. |
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| The main mine entrance has wooden cribbing supporting the portal. The bat gate will have to be located farther back in stable rock. |
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| This vertical shaft, not far from a road, will be closed. A false bottom will be created using polyurethane foam (PUF), then the hole will be filled with surrounding material. |
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| Warm air escapes through this shaft at the top of the mine, pulling cold air into a north-facing adit below, creating perfect hibernation conditions for bats. A metal cupola will be built over the top, preventing access, protecting the existing historic structures, and allowing bats to fly out. |
Other species are feeling the chill as well. This Great Basin gopher snake (Pituophis catenifer deserticola) was all stretched out on Fish Slough Road, soaking in some warmth. Despite the fact that I swerved around him on the road, he wasn't very happy when we went to check on him. He puffed up with air, hissed loudly, and vibrated his tail in his best rattlesnake impression. Sorry buddy, you can't fool us! You're welcome for not running you over though. =PWinter is coming...
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