Strip away the film mythology and Alcatraz becomes a set of numbers: cell dimensions, count frequencies, staffing ratios and shipping costs.
Key numbers
| Operating years | 1934–1963 |
| Main cells | 336 |
| Cell size | About 5 ft × 9 ft |
| Typical population | 260–275 |
| Total inmates | About 1,545 |
| Guard-to-inmate ratio | Roughly 1 to 3 |
| Daily counts | A dozen or more |
| Escape attempts | 14, involving 36 men |
Rules and privileges
Inmates were guaranteed food, clothing, shelter and medical care. Work, visits, the library and yard time were privileges to be earned — and lost. The early silence rule was among the most resented policies and was eventually relaxed.
Costs
Everything arrived by boat, including fresh water. That logistics burden, plus salt-air corrosion, is what eventually closed the prison — see why Alcatraz closed.
Myths worth correcting
- The Birdman kept no birds on Alcatraz.
- Sharks in the Bay are not man-eating species; cold and current were the real barriers.
- Inmates were not sentenced to Alcatraz directly; they were transferred there.
- The food was, by design, among the best in the federal system.
Frequently asked questions
How cold is the water around Alcatraz?
Typically around 50–55°F year-round, cold enough to cause rapid hypothermia.
Were there sharks around Alcatraz?
The Bay has sharks, but not species that threaten swimmers. Cold water and strong currents were the real obstacles.