Built: 1978
Location: Chesterville, Ontario, on the South Nation River.
Drainage Area: 1,050 km²
Structure: Six-bay reinforced concrete structure with automatic gate control.
Uses: Previously supplied water to the Nestlé Canada Inc. plant; currently supports flood control.
Safety Features: Operational plans establish seasonal water levels, public awareness materials and require public notification of water
level changes. 

Built: Circa 1900; modified in 1975.
Location: Crysler, Ontario, on the South Nation River.
Drainage Area: 1,300 km²
Structure: Features an overflow section, retaining walls, and a stop log channel. Original intake
channel (now plugged) was used for milling.
Uses: Improves water quality through low-flow augmentation and provides recreational opportunities.
Modifications: Strengthened stone and timber construction, added a downstream concrete apron, and constructed flow channels for
low-flow augmentation.

Built: 1980s in response to a Flood Damage Reduction Study.
Location: Northeast of the Crysler Dam, along the South Nation River.
Structure: Earth berm (420 m long, 3–5 m high) with internal drainage systems, including storm drains with backflow valves, concrete catch basins, culvert pipes, and manholes.
Purpose: Mitigates flood hazards for the Village of Crysler by protecting the southern bank of the South Nation River.

Built: 1958; raised in 1996 by 0.6 m.
Location: Casselman, Ontario, on the South Nation River.
Structure: Overflow section with a one-bay stop log channel.
Uses: Supports recreation, low-flow augmentation, municipal water supply, and hydroelectric generation.
Hydroelectric Plant: A 375 kW facility, constructed in 1987, diverts water upstream of the weir.

Built: 1967 (replacing an unreinforced dam built in 1916 that failed in 1959).
Location: Russell, Ontario, on the Castor River.
Structure: Reinforced concrete weir with a stilling basin (21 m long, 5 m wide, 1.2 m deep) and a non-operational steel sluice gate.
Purpose: Regulates discharge from the Castor River to manage water flow.

Built: Early 19th century.
Location: Spencerville, Ontario, adjacent to the historic Spencerville Mill on the South Nation River.
Structure: Designed to create a millpond for the Spencerville Mill, with historical community significance.
Uses: Supports recreational activities, such as upstream canoeing, and preserves the milling heritage of the area.
Current Status: Owned and maintained by the Spencerville Mill and Museum Foundation as a heritage feature contributing to recreation and
local history.

Built: 1980 to replace a natural limestone ledge.
Location: Plantagenet, Ontario, on the South Nation River.
Structure: 117.5 m long, 0.6 m thick, and 1.2 m high with galvanized wear plates bolted to angle-iron plates anchored into the concrete crests.
Drainage Area: 3,810 km² with a 10 km impoundment length.
Purpose: Prevents flooding and manages water flow by mitigating spring freshet debris jams.

Built: Between 1987 and 1990 to stabilize riverbanks.
Location: Approximately 2 km north of Casselman, Ontario, along the northeast bank of the South Nation River.
Structure: Rock berm spanning 1,800 m, constructed to prevent toe erosion along the riverbank.
Purpose: Protects more than 50 residential properties in a potential retrogressive landslide area.