From I-70, whether east or westbound, take the exit (232) for US 40 that goes over Berthoud Pass to Winter Park. Follow the highway to Empire, then to the small town of Berthoud Falls. From the center of Empire, it's about 11.9 miles to the turnoff on the left (south side of highway) that comes just before the first switchback that begins the climb on US 40 to Berthoud Pass. The road you're turning onto is CR 202 that goes to the Henderson Mine. Follow this paved road west for .6 mile and make a left turn onto FR146, also known as the Wood's Creek Road. On Google Earth this road is identified as FR 203. The road becomes graded gravel and will climb steeply in places to the trailhead. We measured the driving distance as 3.2 miles from the Henderson Mine Road. The Wood's Creek Road will take you by several evaporation ponds and two reservoirs. The upper one is called "Urad Reservoir." About half way up this road, the condition will deteriorate some and you'll encounter more potholes and cobble that slows driving, hence the recommendation for a higher clearance vehicle. For those accessing our suggested route for Engelmann Peak via Ruby Creek, park at these coordinates just a little north of where Ruby Creek crosses the road: N 39° 45' 13.58" W 105° 49' 29.75". For the Hassell Lake trail, parking can be found in the vicinity of the crossing of Woods Creek and primitive camping is available as well.
Primitive camping is available in the vicinity of the trailhead with several sites to choose from. The worst night we have ever experienced in the mountains was at this location. After climbing Hassell in the later afternoon, we returned to our vehicle and decided to spend a Friday night here. As the evening wore on, more and more vehicles poured into the trailhead area. All the possible campsites were quickly taken and others had to drive back down the road. Two different parties proceeded to engage in boistrous partying that continued on through most of the night. With no regard for other campers, they played loud music, shot off guns and talked and yelled loudly. One group continued doing this until 2:00 AM, the other until 4:00 AM. We needed to get up by 5:30 AM. We got all of an hour and a half of sleep that night and left swearing that we would never again camp at-large on the Front Range ever again. Moral of this story - camp here at your own risk.
There is a fee-type National Forest campground called "Mizpah" on the south side of US 40 just east of Berthoud Falls. This campground has 10 sites suitable for tent or RV, vault toilets and water by pump. The Arapaho National Forest website indicates the campground is currently closed because of culvert damage and associated road damage. You should check with the forest service before trying to utilize this spot. If you can camp here, you may at least get a better night's sleep.