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| Aar Dam | |
|---|---|
 The main dam and reservoir. | |
  Location of Aar Dam in Germany | |
| Country | Germany |
| Location | Lahn-Dill-Kreis |
| Coordinates | 50°41′59″N08°27′17″E / 50.69972°N 8.45472°E /50.69972; 8.45472 |
| Construction began | 1984 |
| Opening date | 1991 |
| Dam and spillways | |
| Type of dam | Embankment, rock-fill |
| Impounds | Aar |
| Height (foundation) | 15 m (49 ft) |
| Height (thalweg) | 14 m (46 ft) |
| Length | 270 m (890 ft) |
| Elevation at crest | 272.5 m (894 ft) |
| Width (crest) | 6 m (20 ft) |
| Dam volume | 90,000 m3 (3,200,000 cu ft) |
| Spillway capacity | 75 m3/s (2,600 cu ft/s) |
| Reservoir | |
| Creates | Aartalsee |
| Total capacity | 4,085,000 m3 (3,312 acre⋅ft) |
| Catchment area | 60.5 km2 (23.4 sq mi) |
| Surface area | 57 hectares (140 acres) |
| Normal elevation | 270 m (890 ft) |
| Installed capacity | 0.25 MW (340 hp) |
TheAar Dam and its reservoir, theAartalsee, lie in the upperAar valley in the German state ofHesse. Both are in the municipalities ofBischoffen andHohenahr in the county ofLahn-Dill-Kreis and about 15 km northwest of the town ofGießen inHesse. On the lakeshores lie the villages ofAhrdt andMudersbach, both part of the parish ofHohenahr. Since 1991 the dam has impounded the RiverAar, a left-hand tributary of theDill in theGladenbach Uplands. The reservoir is also fed by the Stadterbach, Wilsbach (into theforebay), Weidbach and Meerbach (into the main reservoir).
Thedam is primarily used forflood protection for the Aar and Dill. In Winter the reservoir is filled to a capacity of 1.33 million m³; in summer this rises to 1.84 million m³. Other uses are: raising low water levels, electricity generation, fishing and recreation. As a result, the dam and reservoir also contribute economically to the region. The reservoir was opened in 1992 as abathing lake.
Its operator is the county council of Lahn-Dill-Kreis and the Dillgebeit Water Association.
