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In page Assiut Barrage:

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The piers between the openings have a length of 51 feet (16 m) up and down stream and are 6.56 feet (2.00 m) wide with the exception of every thirtieth pier, which has double this width. The roadway is 41 feet (12 m) above the top of the masonry platform. The dam has a maximum height of about 48 feet (15 m), the maximum head of water retained being about 33.5 feet (10.2 m). It is constructed of granite, the foundation platform mentioned above being of concrete. A lock 262.5 feet (80.0 m) long by 52.8 feet (16.1 m) wide and capable of passing the largest Nile cargo ships and barges was constructed at the dam.[3]