Wipe Out!

I decided to try my hand at placing micro caches. I saw one like this:

Little baggie with a log inside
STRONG magnet
Duct tape

Stick to something metal



So, I decided to place on on a guard rail near my home. Here's your clue: I had to reach through THESE


To place the cache.

I called it Wipe Out! since heavy rains can literally wipe out the bridge!