From Ursine, it is about five more miles to Spring Valley State Park headquarters on the site of a historic ranch. Many ranches were established in this well-watered vicinity in pioneer times. As in the other parks, Spring Valley State Park centers upon a man-made body of water. Eagle Valley Reservoir is a 59-acre lake behind a dam constructed in 1965. Rainbow trout are the primary fish caught by anglers there.
Fishermen try their luck from the shore or from boats.
A boat launching and docking area is near the park's entrance. A 12-unit picnic area is handy to the reservoir and the dock. Spring Valley State Park's main campground is also near the dam on the opposite side of the park road. Horsethief Gulch Campground is the larger of two campgrounds in this park. It has 36 campsites, each with table, grill and sun shade.