Chashma Barrage is one of the six river structures provided under Indus Basin Project and is the highest amongst all. It is located on river Indus some 56 Kms downstream of Jinnah Barrage near Kalabagh Town. It's purpose is to supply water to CJ-Link Canal on the left and Chashma Right Bank Canal on the right. Un-like other barrages, a small amount of storage has been provided at this Barrage. To pass anticipated maximum design flood discharge of 9,50,000 Cusecs, 52 Gates each 60 ft. wide have been provided in the Barrage. A Fish Ladder and Navigation Lock have also been provided. Two head regulators, one for CJ-Link Canal and the other for CRBC exist on the left and right banks respectively. A low head hydel power station has been recently constructed on the right side of Chashma Barrage.

Financing of Indus Basin Project was made by the World Bank and the other donors were Govt. of Australia, Canada, Germany, Newzeland, United Kingdom & USA respectively.

The Contractor for Chashma Barrage works was awarded on 10th February 1967 to French Consortium Societe Dumez and Societe Borie and was successfully completed by 25th March 1971. The total cost of Chashma Barrage works was Rs.399 million.

Length between abutments 3556 ft. Total Bays 52 Nos. Standard Bays 41 Nos. Undersluce Bays 11 Nos. Normal Pond Level 642 ft. Maximum Storage Level 649 ft. Maximum Flood Discharge 950000 Cs. Maximum Intensity of Discharge 300Cs. Per ft. Width of Carriage Way 24 ft. Length of Navigation Lock 155 ft. Width of Navigation Lock 30 ft. Area of Reservoir 139 Sqm. Initial Capacity 0.87 MAF Contract Price Rs.399 Million Date Commencement 10th February, 1967 Date of Completion 25th March, 1971 Contractor Societe Dumes Enterprises Borie Consulting Engineer COODE & Partner London.

Updated as on 11th November, 2009