Panama Canal Locks: Gatun vs. Miraflores – Differences & Similarities

The Panama Canal uses two lock complexes to lift ships 85 ft (26 m) to Gatun Lake and lower them to sea level:

Gatun Locks (Atlantic Side)

• Configuration: 3 chambers in series.
• Function: Raise ships from Caribbean Sea to Gatun Lake level.
• Dimensions: 1,000 ft (305 m) long × 110 ft (33.5 m) wide (original); New Panamax locks (2016): 1,400 ft × 180 ft × 60 ft draft.
• Water Source: Gatun Lake (artificial, 164 sq mi).

Miraflores Locks (Pacific Side)

• Configuration: 2 chambers (original); New Panamax: 3 chambers.
• Function: Lower ships from Gatun Lake to Pacific.
• Dimensions: Original: same length/width as Gatun; New: same as new Gatun.
• Water Source: Miraflores Lake (smaller, downstream).

Key Differences

• Location & Direction: Gatun = Atlantic → Lake (up); Miraflores = Lake → Pacific (down).
• Chamber Count (Original): 3 vs. 2 (due to tidal range difference: Pacific has higher tides).
• Water Source Lakes: Different reservoirs.

Similarities

• Operating Principle: Gravity-fed water transfer between chambers; no pumps.
• Gate Design: Miter gates (V-shaped, seal under pressure).
• Control Systems: Centralized hydraulic/electric control towers.
• Expansion (2016): Both upgraded to New Panamax dimensions simultaneously.
• Economic Role: Both essential for transit; tolls based on vessel size/type.

Together, they enable the 50-mile shortcut saving 8,000 miles vs. Cape Horn.