I Found this review on the web....sounds like it could be an interesting outing.
We did the Lake Pleasant to Copperopolis run in mid March 2008. This trail follows Castle Creek up to the copper mine. We were guests of the Southwest Pinzgauer club on this run. If you don't know what a Pinzgauer is, it's an extremely capable Austrian military vehicle from the 60's.
I rate the difficulty of this trail between a 4 and a 5 for big rocks. Moderately high clearance is a must (I made it with 8.8 inches at my transfer case skid plate – which I bottomed out on multiple times). 4 wheel drive is recommended, a 2 wheel drive would probably have trouble in the sand. Long wheel base vehicles can make this trip, but some tight turns require special attention. Needless to say, the Pinzgauers had no trouble with this trail. “Arizona Backroads and 4-Wheel Drive Trails” mentions this trail but does not review it. They use a route from Wickenburg (Wickenburg Mountains trail), which they rate as moderate. They mention this trail on the Wickenburg Mountains map as 'Alternate way out via Castle Creek – difficult, dangerous, road washed out!'. The hardest parts of the trail are in the Castle Creek wash. Even though they mention it as 'Difficult', I believe a 4-5 difficulty rating is justified, but, this trail should not be done alone. The risk of getting stuck, flat tire, or undercarriage damage is pretty high.
The trip took most of the day. The caravan (about 10 Pinzgauers, my Jeep, a Toyota 4Runner, and a ¾ ton Dodge truck) left Peoria around 8 am and we passed the meeting point at around 4pm on the ride home.
The most memorable point on the trail was about a mile or so away from the mine. The trail turned out of the wash, up a 2-3 foot sediment embankment, then very quickly turned right. Directly ahead lay one big rock with another large rock just past it and off to the right. My Jeep's tight turning ability made it easy to weave between the rocks, but I knew the Dodge, who was following me, would have a tight fit. I pulled up 50ft or so to the base of the next sedimentary embankment. The Dodge was too concerned with why I stopped and didn't see that first rock. His steering stabilizer took the brunt of the damage, but so did his front diff cover and oil pan. We never would have gotten him off there if the Pinzgauer guys hadn't come prepared for just such a situation. A bottle jack, a shovel, and a few good yanks from behind and he was free. The Dodge was able to continue, but the steering stabilizer was a total loss.
We were fortunate enough to see some desert wildlife on this trip. Near the mine, the largest Javalina I've ever seen wandered out onto the trail. He had to be close to 2 feet at the top of his head. At the mine, we spotted a 3 point mule deer. These sightings alone were worth the trip!
The route from Wickenburg is where the historical sights are. I'm told there are relics at some of the nearby mines along this route, as well as the grave site of Isaac Bradshaw – the mountain range's namesake. The Wickenburg route is definitely on my todo list.
Maps and GPS Coordinates
CSTLHTSP33 58.892 -112 21.71 1965 3/10/2008 0:19:27
10 33 59.837 -112 23.018 2112 3/10/2008 0:18:49 TURN NE
9 33 59.89 -112 22.919 2113 3/10/2008 0:18:39 TURN NW
8 34 0.195 -112 23.712 2144 3/10/2008 0:17:35 CONTINUE NW
7 34 0.778 -112 24.534 2249 3/10/2008 0:17:17 HEAD NORTH
6 34 1.546 -112 25.631 2357 3/10/2008 0:16:12 HEAD WEST
5 34 2.37 -112 27.119 2537 3/10/2008 0:15:37 STAY RIGHT
4 34 3.693 -112 28.526 2789 3/10/2008 0:15:15 TURN RIGHT
3 34 4.092 -112 28.335 3061 3/10/2008 0:15:04 TURN RIGHT
2 34 4.206 -112 28.103 3176 3/10/2008 0:14:30 TURN RIGHT
Mine 34 4.793 -112 27.884 3221 3/10/2008 0:11:40
Click the map to see in full size.