Given the following context:

In 1929, the Lions Club purchased two sizable portions of land on the peak, and deeded 200 acres (80.9 ha) to Medford for recreational use the following year. In 1931, the city acquired another 1,500 acres (607.0 ha) via the Recreation and Public Purposes Act, and 40 acres (16 ha) more in 1933. The park was dedicated in 1937 to George J. Prescott, a Lions Club leader and Medford police officer who was killed on duty on March 16, 1933.Starting in 1933, the Civilian Conservation Corps (CCC) made the first improvements to Prescott Park, including constructing 18 miles (29 km) of trails and a 16-foot-wide (4.9 m) access road (Roxy Ann Road), creating several picnic areas and overlooks, and digging drainage ditches. The CCC stopped work in 1942, soon after the beginning of World War II. Park maintenance ceased due to municipal budget problems, and gasoline rationing caused the number of visitors to drop markedly. By 1956, the CCC's improvements had suffered $110,000 in damage. The trend of disrepair continued for several decades.During the late 1990s, the park experienced a surge in vandalism, littering, and wildfires caused by off-roading, and Roxy Ann Road became nearly impassable because of lack of maintenance. Medford police officers had to devote much of their time to patrolling the mountain, made difficult by the park's remote location. To alleviate these problems, the city regraded Roxy Ann Road in 1998, and installed two gates near the park entrance two years later. By 2006, vandalism had decreased by 70 percent.At 1,740 acres (704.2 ha), Prescott Park is Medford's largest park, covering much of the upper slopes and summit of Roxy Ann. It is two and a half times larger than the city's other parks combined.

answer the following question:

What experienced a surge in vandalism, littering, and wildfires caused by off-roading? 

Prescott Park