Abstract: A concrete pressure monitoring device in an apparatus for continuously forming an elongated monolithic concrete structure within a prepared excavation. The device includes a pressure sensitive membrane exposed to wet concrete between a bottom surface of the excavation and an inner form member of the apparatus. The membrane covers an open end of a fluid filled housing so that variations in concrete pressure adjacent the membrane will flex the membrane to cause displacement of fluid within the housing. A remote indicator responsive to displacement of fluid within the housing is operatively connected to the housing to indicate the concrete pressure variations.