The barrier structure of the Henne dam is a rockfill dam with a two-layer asphalt concrete outer seal with a drainage layer and a special braking zone to prevent seepage inside the dam. It was one of the first dams with a surface seal made of asphalt concrete. Another special feature is the crown protection structure, a reinforced concrete construction weighing 5,000 tonnes under the crown of the structure.

Water management
Reservoir capacity	38.4 millionm3
of which forebay	0.73 millionm3
Reservoir level above sea level	323,30 m
Catchment area
Henne	55.15 km2
Diversions	43.93 km2
Total area	99.08 km2
Reservoir surface area at reservoir target	2.10 km2
Barrier structure	Rockfill dam (with surface seal)
Greatest height	60 m
Crown length	376 m
Largest base width	250 m
Crown width	10 m
Dam capacity	around 1.3 millionm3
Bottom outlets
2 steel pipelines with a diameter of 1.5 m laid in two separate tunnels Regulation: Ring piston valves or power station
Max. flow rate per bottom outlet	26m3/s
Spillway
Fixed weir made of reinforced concrete with a crown length of 33 m, horizontally movable gate at the upper end of the spillway, followed by weir channel and energy conversion structure
Max. flow rate	42m3/s
Discharges
Average annual inflow (1961 - 1993)	23.9 millionm3
Structures:
Diversion of the Brabecke to the Kleine Henne:
Tunnel length	2.5 km
Clearance height	2,13 m
Clear width	1,76 m
Stream development "Kleine Henne"	3.2 km
Diversion of the "Kleine Henne" to the Horbach:
Tunnel length	1.8 km
Clearance height	2,26 m
Clear width	1,96 m
Horbach" creek development	2.3 km
Mielinghausen forebay with a forebay dam
Dam height above sea level	323,30 m
Dam height above the valley floor	12 m
Dam height above the rock base	17 m
Crown width	10 m
Crown length	175 m
Largest base width	62 m
Bulk masses	around 50,000 m³
Sealing through internal stone scaffold clay body
The hydropower plant has an output of 2.0 MW and supplies an average of 5.8 GWh of electricity per year. It is operated by Lister- und Lennekraftwerke GmbH, a wholly owned subsidiary of the Ruhrverband.
Power stations
Supply lines through the left bottom outlet with a diameter of	1,5 m
Branch lines to the turbines with a diameter of	0.8 m and 0.5 m respectively
2 machine sets:
Effective gradient	56 m
Set 1
Siphoning capacity	3.6m3/s
Capacity	1,400 kW
Set 2
Capacity	1.6m3/s
Capacity	600 kW