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| Mio Dam | |
|---|---|
| Name | Mio Dam |
| Location | Mio, Michigan, Oscoda County, Michigan |
| Country | United States |
| Status | Operational |
| Construction begin | 1910s |
| Opening | 1916 |
| Owner | City of Detroit (original developer), later Consumers Energy |
| Dam type | Concrete gravity |
| Height | 35 ft |
| Length | 360 ft |
| Reservoir | Au Sable River impoundment (Mio Pond) |
| Plant capacity | ~0.5 MW |
Mio Dam Mio Dam is a low-head concrete gravity dam on the Au Sable River near Mio, Michigan in Oscoda County, Michigan. Built in the early 20th century to provide hydroelectricity and flow regulation, it forms the impounded stretch commonly called Mio Pond and sits within a landscape shaped by logging, railroads and early 20th-century industrialization. The facility has played roles in regional power supply, navigation, flood moderation, and recreation linked to nearby state and federal conservation lands.
Mio Dam occupies a strategic site on the Au Sable River between several historical and recreational centers including Grayling, Michigan and Alpena, Michigan. The structure is associated with regional entities such as Consumers Energy, historical firms like the Detroit Edison Company, and is proximate to transportation corridors including M-33 (Michigan highway), local rail lines formerly operated by the Detroit and Mackinac Railway, and public lands administered by the US Forest Service. Its presence influences downstream communities including Oscoda, Michigan and intersects with policy frameworks administered by agencies such as the Michigan Department of Natural Resources and the Federal Energy Regulatory Commission.
Construction of Mio Dam commenced in the 1910s amid a period of expansion for utilities driven by companies like the Detroit Edison Company and municipal actors such as the City of Detroit. Early 20th-century demand for electricity from growing urban centers including Detroit, Michigan and industrial complexes in Saginaw, Michigan and Flint, Michigan spurred small hydro projects on tributaries of the Great Lakes. Contractors and engineers influenced by precedents at sites like the Croton Dam (Michigan) and designs promoted by firms with ties to the American Society of Civil Engineers executed the concrete gravity design. The facility was commissioned circa 1916, later transferred among owners associated with regional utilities including Consumers Energy, and has undergone periodic rehabilitations in coordination with regulatory review by the Federal Energy Regulatory Commission and oversight by the Michigan Department of Environmental Quality.
Mio Dam is a concrete gravity structure with an overall height in the range of approximately 30–40 feet and a crest length on the order of several hundred feet, impounding a riverine reservoir commonly known as Mio Pond on the Au Sable River. The project includes a spillway, sluice gates, intake structures feeding a small powerhouse, and low-head fish passage accommodations retrofitted over successive upgrades. Mechanical plant components reflect early 20th-century generator and turbine technology adapted to run-of-river operations; original equipment paralleled installations at contemporaneous sites like Foote Dam (Michigan) and Webbers Falls Dam. Civil features reference standards promulgated by organizations including the US Army Corps of Engineers and the Bureau of Reclamation for concrete dam safety and hydraulic capacity.
The powerhouse at Mio Dam hosts turbines sized for modest output suitable for local distribution; nameplate capacity is on the order of several hundred kilowatts, contributing to grid inputs managed by Consumers Energy and regional transmission operators like Midcontinent Independent System Operator. Operations typically follow run-of-river protocols, balancing generation with downstream flow commitments to stakeholders including the Michigan Department of Natural Resources and municipal water users in communities such as Mio, Michigan and Comins, Michigan. Maintenance, relicensing, and environmental compliance have entailed coordination with the Federal Energy Regulatory Commission and consultation with conservation organizations including The Nature Conservancy active in the Au Sable River watershed.
While not a large-scale flood control reservoir like projects delivered by the US Army Corps of Engineers, Mio Dam contributes to local flow moderation in the Au Sable River system and has operational rules developed in concert with upstream and downstream impoundments such as Backus Creek Dam and Foote Dam (Michigan). Water management considerations incorporate seasonal runoff influenced by the Huron-Manistee National Forests, snowmelt patterns affecting communities like Grayling, Michigan, and regulatory frameworks under the Michigan Department of Natural Resources and interstate compacts relevant to Great Lakes watershed stewardship. Emergency action planning coordinates county responders in Oscoda County, Michigan and state agencies for high-flow events.
Mio Dam affects aquatic connectivity, sediment transport, and temperature regimes of the Au Sable River, with implications for native fish such as brook trout, rainbow trout, and brown trout that are central to regional angling cultures noted in places like Grayling, Michigan. Remedial measures, including fish passage projects, habitat restoration partnerships with the Michigan Trout Unlimited chapter, and riparian restoration supported by the Michigan Department of Natural Resources, aim to mitigate impacts documented by researchers at institutions such as Michigan State University and conservation groups like The Nature Conservancy. The impoundment also alters wetland dynamics and supports assemblages of waterfowl monitored by organizations including the Audubon Society.
Mio Pond and adjacent shoreline provide boating, angling, and paddling access valued by local tourism economies tied to communities including Mio, Michigan, Grayling, Michigan, and Alpena, Michigan. Access points and trailheads connect to recreational infrastructure managed by the Michigan Department of Natural Resources and the US Forest Service within the Huron-Manistee National Forests, and events such as regional fishing tournaments draw participants from across Michigan. Proximity to roadways like M-33 (Michigan highway) and nearby public boat launches facilitate day use, while lodging and outfitting services in Oscoda County, Michigan support multi-day excursions.
Category:Dams in Michigan Category:Hydroelectric power stations in Michigan