(1988) claimed that it often exceeded this limit. The jail also had a library, which was established in 1967 and housed 3,000 volumes. In general, the jail was known for being the subject of multiple grand jury investigations for security concerns, dirty conditions, access to drugs, violence, lack of organized programming, and most notably, during the 1960s and 1970s for severe overcrowding. Further attempts to replace the Rocky Butte jail were motivated by a successful escape in 1981 and a gun smuggling incident that resulted in an officer being shot in 1982. The Multnomah County Detention Center (MCDC) was built in downtown Portland after Rocky Butte Jail was demolished in 1984 to make way for Interstate 205. The Rocky Butte Jail and MCDC participated in a study on prisons, which was published in 1988 in the journal Crime & Delinquency. In 1934, the Rocky Butte Scenic Drive Historic District was established. Built as part of a Works Progress Administration project that supported 25,000 employees in Portland, it was designed by the Multnomah County Road Department, The drive reaches the summit of Rocky Butte to a viewpoint overlooking Portland. Workers used basalt from the Rocky Butte quarry to create retaining walls, and the finished project was designed to have a rustic style typical for public works projects of the time. WPA workers also built the park and a baroque staircase at the top of Rocky Butte, finishing construction in 1939. At its peak popularity in the 1940s, Rocky Butte had more than 4,000 cars visiting each day. Over time, the park had far fewer visitors and fell into disrepair. During the 1970s, the summit became a frequent site for teenage parties; excessive littering and graffiti were commonplace. In the early 1990s, the Rocky Butte Preservation Society began cleaning up and restoring the park area and adding new amenities. Once of land were added and the Preservation Society took on an active maintenance role, the site was regraded, original plaques were reinstalled, and lawn areas, irrigation, red cinder walkways and additional trees, flowers, shrubs and grass were added to the park. The District was listed on the National Register of Historic Places in 1991. Other WPA projects included a tunnel in length at the southern end of Rocky Butte. Built between 1939 and 1941, it was constructed to improve access to scenic views on the Butte. The project took 16 months to