Maximum Custody: How Security Worked at Alcatraz

“Maximum custody” was the central idea behind Alcatraz. This page explains what that meant in practice: how often inmates were counted, how the cellhouse was built, why guards carried whistles, and what role the surrounding water played.

Constant watching

The system relied on a tight timetable and unbroken supervision. Official counts took place as often as every 30 minutes during the day, and in some work areas unofficial counts happened twice as frequently. Wherever the men went, whether the mess hall, workshops, chapel, shower room or cellhouse, doors were locked and windows were fitted with tool-resistant steel bars.

Unarmed officers patrolled on foot, backed up by armed colleagues in protected gun galleries. When inmates crossed the island to and from the factories, armed guards in elevated towers followed them. Fixed and portable metal detectors, nicknamed “snitch boxes”, were used to find contraband. Behind all of this stood an extra layer of protection: anyone who got out had to swim at least a mile and a quarter through hazardous bay water.

What about the swimmers?

San Franciscans do swim in the bay. In 1933, the year the Justice Department’s acquisition of Alcatraz was announced, a group of local high school girls swam around the island. Many others have since done the same, and swimming clubs use Aquatic Park every day. Today organised swims are also held around Alcatraz.

The difference is preparation. Those swimmers are trained, conditioned cold-water athletes who pick times when the tide is mild. Inmates had no tide charts and no chance to practise in cold water.

A harsher routine, not a harsher building

According to Warden Johnston, Alcatraz was essentially like other prisons. It was simply smaller and more isolated, its rules were stricter though applied fairly, and its population changed very little, whereas other prisons had to absorb a constant stream of new arrivals from the courts.

These traits supported the philosophy of maximum custody with minimum privileges, which aimed at a dull routine. People have called it the “exquisite torture of monotony”. A man lived in a tiny cell inside a small cellhouse, wore the same plain uniform as everyone else and marched to repetitive jobs. On a break he talked with the same colleagues he saw every day, and nobody had weekend plans to discuss. One inmate told the warden that he had nothing against the place and was treated fairly, but was tired of hearing the same complaints from the same people day after day.

Cell doors without keys

In the older military cellblock, A Block, each door used a lock and key and a lever that secured the whole block, so releasing one man meant partly unlocking every cell on his tier. When the federal prison took over, the two blocks chosen to hold inmates received new fronts with “tool proof” bars. A system of levers and pulleys opened and closed doors, either one at a time or all together.

One purpose was to remove keys, which can be stolen or copied. An unarmed cellhouse officer operated the mechanisms at the end of each block while an armed gallery guard looked on.

The same reasoning applied to weapons. Officers on the floor carried whistles rather than guns. If an inmate seized a whistle, that was a problem but not a crisis. If he took a firearm, it would become one.

Could inmates reach the guns?

Once, in 1946. During the Battle of Alcatraz an inmate spread the bars of the west-end gun gallery, overpowered the officer and took his keys and weapons. He gained only two firearms, a rifle and a handgun. The real stockpile was in the armory near the front of the prison, run by the officer who controlled the cellhouse sallyport.

The sallyport was a short passage locked at both ends and watched from the neighbouring armory, which inmates could not enter. The armorer unlocked one door, let a person in and locked it again behind them before opening the next. If a hostage situation or an attempted escape occurred, he could seal the whole passage. This design mattered to officials because John Dillinger’s gang had once captured an entire police weapons cache during a jailbreak shortly before Alcatraz opened.

Metal detectors were placed at the dock, the front entrance, the rear door and the foot of the stairs leading to the work areas. Buoys marked a perimeter 200 yards out in the bay, with warning signs for boats. Many inmates still had partners outside, and rumours of an armed rescue from the water recurred. In practice, tower guards occasionally used spotlights or warning shots, but the only trouble from the water came from curious sightseers and becalmed sailors.

Homemade weapons

Real firearms appeared only during that 1946 event, but inmates had all day to look for ways around the rules. Almost anything could become a weapon, including broken glass taped to a book cover, a sharpened screwdriver or machine part, or even paper towels that had been dampened and braided.

Continue with the Alcatraz mess hall, solitary confinement or riots and strikes to see how these systems were tested.

Why the design worked

Maximum custody depended on layers rather than on any single feature. Counts caught a missing man within minutes, locked doors and barred windows slowed anyone who tried to leave a building, towers and gun galleries covered the open ground, and the bay served as the last barrier. Officials also paid attention to small details that other prisons overlooked, such as removing keys from the cell system and keeping the main weapons store behind a double-locked passage. The result was a facility with few opportunities for improvisation, which is why even the rare incidents, described on the pages about escapes and the 1946 riot, are remembered in such detail.