Pages 25 and 33 on your DeLorme Map. Heading northeast from Fennimore on County Road Q. Castle Rock is also known as the Fennimore Fork.
Castle Rock is a spring creek, which came in handy today. Many of the trout streams I passed on the way to Grant County today were frozen over. Hard to find much fishable water today in the creeks whose springs are less vigorous than Castle Rock. Even vaunted Castle Rock was not entirely free of ice for its duration. In fact, the first truly fishable section was not until you hit Church Road. But it was worth the wait. Castle Rock is a beautiful example of a Wisconsin spring creek; clear, fast water with a somewhat soft bottom and quite a few limestone boulders along the sides, giving it a defined channel.
The photos are from the Church Road section. There is excellent bridge access and no problems with permissions, thanks to the DNR postings on the Northwest side of the creek. The Southeast side of the creek appears to be owned by a game preserve, so I didn't head over there.
Conditions were quite cold without the bright sunshine. In the wind it was downright bitter. This was a snowmobile suit and gloves day, both of which helped immensely because one has to crawl on one's hands and knees to avoid spooking the fish. Castle Rock was crystal clear (see photo) today and the fish were ultra-spooky. I saw six or seven fish of less than 12". No strikes and no fish landed. Still, it was great to get out.
