MIRAFLORES UPPER LOCKS. LOCK ENTRANCE CAISSON IN PLACE AT NORTH END OF EAST CHAMBER. UPSTREAM OR HIGH-WATER SIDE; ALSO SHOWING CHAIN FENDER IN PLACE. APRIL 12, 1915.

MIRAFLORES UPPER LOCKS.

LOCK ENTRANCE CAISSON IN PLACE AT NORTH END OF EAST CHAMBER. END VIEW SHOWING WATER OF MIRAFLORES LAKE HELD IN CHECK. APRIL 12, 1915.

NAOS ISLAND BREAKWATER. LOOKING SOUTH FROM SOSA HILL. JUNE 7, 1915.

PLATE 17.