Wood River begins in south-western Saskatchewan at the height of the
Wood Mountain Hills in semi-arid grasslands within a large region called
Palliser's Triangle. Much of the northern half of Wood Mountain Hills is in the Wood River watershed while the southern half flows south into the United States and the drainage basin of the
Milk River — a tributary of the
Missouri River. This part of the
drainage divide is known as the
Missouri Coteau. Beginning at Pinto Butte at over in elevation, Wood River flows eastward through grasslands, rolling hills, and valleys that were carved by glacial
meltwaters. Near the small community of Summercove, the river turns north-east and begins to head out of the hills where it is joined by several tributaries. Along the route, south of
Gravelbourg, a dam was built that created
Thomson Lake. On the eastern shore of the lake is
Thomson Lake Regional Park, the oldest
regional park in Saskatchewan. Gravelbourg, the largest town along the river's course, is about downstream from the dam. After Gravelbourg, the river continues north-east, passes by Shamrock Regional Park, and flows into the western end of Old Wives Lake. Old Wives Lake is part of an
Important Bird Area (IBA) of Canada and, along with
Reed and
Chaplin Lakes, was designated part of the
Western Hemisphere Shorebird Reserve Network (WHSRN).
Tributaries The following are the tributaries of Wood River from its upper watershed in the Wood Mountain Hills to its mouth at Old Wives Lake: • Tetreau Creek • Patriotic Creek • McCrea Creek • Uteck Creek • Kolskeg Creek • McDonald Creek • Gavelin Creek • Six Mile Creek • Sisterbutte Creek • Nine Mile Creek • Ten Mile Creek • Chubey Creek • Flynn Creek • Stephton Creek • Lynthorpe Creek • Wood Mountain Creek • Gollier Creek • Lafleche Creek • Pinto Creek • Laville Creek •
Notukeu Creek • Grassy Creek • Bull Creek • Russell Creek • Cripple Creek • Wiwa Creek • East Wiwa Creek • Chaplin Creek
Lakes and reservoirs There are several notable lakes and reservoirs within the Wood River watershed. Due to the semi-arid conditions in the region of
Palliser's Triangle, several reservoirs were built to retain water for
irrigation and
consumption. • Summercove Dam () is west of Summercove on Wood River. The dam is high and the reservoir it creates contains of water. It was built in 1949 and upgraded in 1965. It is owned and operated by the
Saskatchewan Water Security Agency. •
Braddock Reservoir is along the course of Wiwa Creek. •
Chaplin Lake is the source of Chaplin Creek. • Midtskogen Lake is connected to Chaplin Lake. •
Thomson Lake is along the course of Wood River. • Twelve Mile Lake is the source of Lynthorpe Creek. •
Gouverneur Reservoir is along the course of
Notukeu Creek. •
Admiral Reservoir is along the course of Notukeu Creek. == Shamrock Regional Park ==