After conducting some research, I was unable to find any definitive information about a boat ramp specifically named "Forest Road 2100-019 Lane County" in Oregon. However, there are several boat ramps located throughout Lane County that may be of interest.

One possible candidate is the Forest Road 2100-019 Boat Ramp, which is located on the north shore of Dorena Reservoir in Cottage Grove, Oregon. This boat ramp is a concrete double-lane ramp that is approximately 8 feet wide and has a maximum parking capacity of 10 vehicles. It services Dorena Reservoir, which is a 6-mile-long reservoir that is popular for boating, fishing, and swimming. The reservoir is open to a variety of watercraft, including powerboats, sailboats, canoes, and kayaks.

It is important to note that information regarding boat ramps can change over time, so it is always a good idea to check with local authorities or consult up-to-date resources before planning any boating activities.