Alberta Environment flood estimates

Alberta Environment collected information during the June 2005 flooding to estimate the peak water flows in rivers across the province. These water flows have been used to predict the likelihood that a flood of similar scale could occur in any given year.

These are preliminary results that will be confirmed as Environment Canada finalizes their information over the next year.


North Saskatchewan River Basin

Station Name

Peak water flow (m³/s)

% chance of this flood occurring in any given year

Highest or next highest peak water flow on record (m³/s)

Brazeau River below Cardinal River

422

5%

668 in 1980

Brown Creek at Forestry Road

109

5 -10%

150 in 1986

Clearwater River near Dovercourt

938

Less than 1%

341 in 1990

Nordegg River at Sunchild Road

220

10%

620 in 1986

North Ram River near Forestry Road

75

2%

72 in 1981

North Saskatchewan River at Edmonton

2612

10 -20%

5800 in 1915

North Saskatchewan River near Rocky Mountain House

2420

1%

4110 in 1915

Prairie Creek near Rocky Mountain House

212

Less than 1%

131 in 1999


Red Deer River Basin

Station Name

Peak water flow (m³/s)

% chance of this flood occurring in any given year

Highest or next highest peak water flow on record (m³/s)

Bearberry Creek near Sundre

227

1 - 2%

123 in 1992

James River near Sundre

685

Less than 1%

237 in 1990

Little Red Deer River near the Mouth

452

Less than 1%

173 in 1970

Raven River near Raven

91

Less than 1%

39 in 1999

Red Deer River at Drumheller

1450

2 - 5%

1260 in 1920

Red Deer River at Red Deer

1510

1%

1930 in 1915

Red Deer River below Burnt Timber Ck.

1220

Less than 1%

693 in 1990


Bow River Basin

Station Name

Peak water flow (m³/s)

% chance of this flood occurring in any given year

Highest or next highest peak water flow on record (m³/s)

Bow River at Banff

174

Greater than 50%

399 in 1923

Bow River at Calgary

791

10%

1520 in 1932

Bow River below Carseland Dam

1980

Less than 1%

1690 in 1995

Bow River at Lake Louise

34

Greater than 50%

71 in 1974

Bow River near the Mouth

1640

Less than 1%

1570 in 1995

Cataract Creek near Forestry Road

39

20%

198 in 1995

Elbow River below Glenmore Dam

301

5%

980 in 1879

Elbow River at Bragg Creek

308

10%

980 in 1879

Fish Creek near Priddis

482

Less than 1%

200 1915

Highwood River at Diebel's Ranch

173

10 20%

661 in 1995

Highwood River below Little Bow Canal

671

1 2%

803 in 1995

Highwood River near the Mouth

1340

Less than 1%

1120 in 1995

Pekisko Creek near Longview

119

1%

100 in 1995

Sheep River at Black Diamond

380

4%

366 in 1995

Stimson Creek near Pekisko

135

Less than 1%

99 in 1995

Threepoint Creek near Millarville

389

Less than 1%

283 in 1967


Oldman River Basin

Station Name

Peak water flow (m³/s)

% chance of this flood occurring in any given year

Highest or next highest peak water flow on record (m³/s)

Oldman River near Waldron's Corner

442

1 2%

1320 in 1995

Crowsnest River at Frank

59

10%

135 in 1995

Castle River at Beaver Mines

206

10%

1430 in 1995

Pincher Creek at Pincher Creek

100

2%

271 in 1995

Chain Lakes Reservoir Inflow
* based on mean daily data

180

2 5%

270 in 1995

Willow Creek at Oxly Ranch

700

Less than 1%

504 in 1995

Willow Creek near Claresholm

694

Less than 1%

498 in 1995

Willow Creek at Highway 811

761

Less than 1%

592 in 1953

Waterton River near Waterton Park

122

20 50%

734 in 1908

Drywood Creek near the mouth

74

10%

425 in 1995

Waterton River near Glenwood

380

10 - 20%

1090 in 1995

Belly River near Mountain View

74

10 - 20%

464 in 1964

Belly River near Glenwood

99

20%

570 in 1995

Lee Creek at Cardston

173

2%

323 in 1964

St. Mary River near Lethbridge

421

5%

731 in 1975

Prairie Blood Coulee near Lethbridge

63

Less than 1%

32 in 2002

Oldman River near Lethbridge

2,550

2%

4670 in 1995

Mosquito Creek near the Mouth

66

Less than 1%

60 in 1996

Little Bow River at Carmangay

30

2 - 5%

106 in 1958

South Saskatchewan River at Medicine Hat

3,790

2 - 5%

5110 in 1995

Milk River at Western Crossing

35

20%

225 in 1964

Milk River at Milk River

79

10 - 20 %

279 in 1986

Milk River at Eastern Crossing

83

20 - 50%

408 in 2002


For technical enquires about this web page please contact Alberta Environment - Environmental Management Water Management Operations Branch at AENV-WebWS@gov.ab.ca