| Lake Sagami | |
|---|---|
 (2025) | |
  Lake Sagami | |
| Location | Kanagawa |
| Coordinates | 35°36′50″N139°11′0″E / 35.61389°N 139.18333°E /35.61389; 139.18333 |
| Type | reservoir |
| Primary inflows | Sagami River[1] |
| Primary outflows | Sagami River |
| Catchment area | 1.064 km2 (0.411 sq mi)[1] |
| Basin countries | Japan |
| Surface area | 3 km2 (1.2 sq mi) |
| Average depth | 19 m (62 ft)[2] |
| Max. depth | 32 m (105 ft)[2] |
| Water volume | 63,200,000 m3 (1.67×1010 US gal)[2] |
| Residence time | 0.05 year[2] |
| Shore length1 | 34.4 km (21.4 mi)[2] |
| Surface elevation | 167 m (548 ft) |
| Frozen | never |
| Settlements | Sagamihara[3] |
| References | [1][2][3] |
| 1 Shore length isnot a well-defined measure. | |
Lake Sagami (相模湖,Sagami-ko) is anartificial lake located inMidori-ku,Sagamihara,Kanagawa inJapan'sKantō region. Created in 1947 after theSagami River wasdammed, it serves as use forrecreational andhydroelectric purposes.[1][3] The lake also served as venue forcanoeing events at the1964 Summer Olympics held inTokyo, located 60 kilometres (37 mi) from the lake.[3][4]
Typical lake flows (in m3/s) are 85 hydroelectric, 10.34 domestic, 4.16irrigation, and 2.15 industrial.[2] Land usage is 87.5% natural, 4.6%agricultural, and 7.9% other.[2]Eutrophication issues have been a serious issue of the lake that was first observed in 1967.[1] The main issue was microcystisalgae bloom and reached its highest cell count of 2,500,000 cells/mL in July–October 1979 (data from 1985).[1] Most vegetation grown around the lake are grassland andweeds while most crops grown arerice andvegetables.[1]Fertilizer application for crops near the lake is moderate.[1]
The lake's creation in 1947 displaced thecareers of manylocal fishermen in the area.[5] In return for their livelihood being taken away, many of these families were offered rental boats in the new lake.[5] No private boats are allowed on the lake as a result.[5] To compensate for the loss of thesmelt,black bass from theUnited States was imported to the lake as was Prussiancarp.[5] Because of the bass, the lake is a popularrecreational fishing area.[5] The lake is also used for couplesdating for boat rides and families. Row boat standard daily rental rates are¥3000 for one person, ¥4500 for two people, and ¥6000 for three people.[5]
In 1984, there were 170 industrial and four municipalsewage treatment plants surrounding the lake.[1]
| Yokohama |
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| Kawasaki |
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| Sagamihara |
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| Core city | ||||
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| International | |
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| National | |
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