St. Mary River (Kootenay River)
| St. Mary River | ||
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| Data | ||
| location | British Columbia ( Canada ) | |
| River system | Columbia River | |
| Drain over | Kootenay River → Columbia River → Pacific | |
| Headwaters |
Purcell Mountains 49 ° 55 '4 " N , 116 ° 34' 36" W. |
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| Source height | approx. 1750 m | |
| muzzle |
Kootenay River Coordinates: 49 ° 37 ′ 36 " N , 115 ° 38 ′ 41" W 49 ° 37 ′ 36 " N , 115 ° 38 ′ 41" W. |
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| Mouth height | approx. 770 m | |
| Height difference | approx. 980 m | |
| Bottom slope | approx. 8.5 ‰ | |
| length | approx. 115 km | |
| Catchment area | approx. 2500 km² | |
| Discharge at the gauge Wycliffe A Eo : 2360 km² Location: 22 km above the mouth |
MQ 1961/1994 Mq 1961/1994 |
51 m³ / s 21.6 l / (s km²) |
| Left tributaries | Dewar Creek | |
| Right tributaries | Redding Creek | |
| Flowing lakes | St. Mary Lake | |
| Small towns | Kimberley | |
 Location of the St. Mary River in the Kootenay River system |
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The St. Mary River is an approximately 115 km long orographic right tributary of the Kootenay River in the southeast of the Canadian province of British Columbia .
River course
The St. Mary River rises at an altitude of about 1750 m in the central west of the Purcell Mountains , 20 km east of Kootenay Lake . It initially flows south for 15 km and then turns to the southeast and finally to the east. The 2.5 km long St. Mary Lake is located on the river. Above this is a section of the river in which the St. Mary River has a meandering behavior. 20 km downstream, the St. Mary River passes the village of Marysville , which belongs to the city of Kimberley further north . The British Columbia Highway 95A between Kimberley and Cranbrook leads a short distance along the river. North of the lower reaches of the Cranbrook / Canadian Rockies International Airport , 8 km south of the city of Cranbrook. Finally, the St. Mary River flows into the Kootenay River, which flows south in the Rocky Mountain Trench near Fort Steele , 15 km northeast of Cranbrook .
Hydrology
The St. Mary River drains an area of about 2500 km². The mean discharge 22 km above the mouth is 51 m³ / s. In June the river carries the largest monthly water volume with an average of 210 m³ / s.