Starved Rock Lock and Dam

Starved Rock Lock and Dam
Name	Starved Rock Lock and Dam
Location	LaSalle County, Illinois, United States
Coordinates	41°19′N 88°58′W
Owner	United States Army Corps of Engineers
Operator	United States Army Corps of Engineers
Opened	1933
Dam type	Concrete gravity
Length	2,173 ft
Reservoir	Illinois River pool

Starved Rock Lock and Dam is a navigation lock and concrete gravity dam on the Illinois River near Oglesby, Illinois. The facility, operated by the United States Army Corps of Engineers, forms a pool used for commercial tow traffic, recreational boating, and water management for the Illinois Waterway linking the Mississippi River and Great Lakes. The site is adjacent to Starved Rock State Park and has influenced regional development in LaSalle County, Illinois, Peru, Illinois, and LaSalle, Illinois.

Location and Description

Starved Rock Lock and Dam is located downstream of the Illinois River confluence with the Mendota Channel and lies within the glacially influenced landscape of northern Illinois. The structure is situated near the Illinois Valley and close to infrastructure including Interstate 80, U.S. Route 6 (Illinois), and the Illinois Railway corridor. The project creates a navigation pool upstream extending toward the Hennepin Canal Parkway State Park and interfaces with tributaries such as the Fox River (Illinois) watershed. The site sits within the jurisdictional boundaries of the U.S. Fish and Wildlife Service and is adjacent to lands managed by the Illinois Department of Natural Resources.

History and Construction

Plans for locks and dams on the Illinois River were shaped by legislation including the Rivers and Harbors Act and initiatives promoted by the U.S. Army Corps of Engineers during the early 20th century. Construction of Starved Rock Lock and Dam began in the late 1920s under engineers influenced by practices developed on the Ohio River and Missouri River navigation systems. The project was authorized as part of a broader program linking the Great Lakes Waterway to the Mississippi River; it involved contractors and firms from the Chicago region and attracted laborers from LaSalle County, Illinois communities during the Great Depression. The facility was completed and commissioned in 1933, contemporaneous with other Corps projects such as Lockport Lock and Dam and Peoria Lock and Dam on the Illinois River.

Design and Specifications

The lock is a single-chamber navigation lock designed to standard dimensions compatible with the McClellan-Kerr Arkansas River Navigation System and inland waterways conventions of the period. The dam is a concrete gravity structure with movable gates forming a fixed pool; mechanical and electrical systems were originally specified by Corps engineers with later retrofits by regional contractors. The site includes a lock chamber approximately 110 by 600 feet, a concrete ogee dam section, tainter gates, hoisting machinery, and upstream guide walls. Hydrological parameters are coordinated with the National Weather Service River Forecast Center and integrated into water management plans used by the Illinois Environmental Protection Agency and the U.S. Geological Survey. Structural inspections follow criteria established by the American Society of Civil Engineers and standards adopted by the Corps.

Operations and Navigation

Starved Rock Lock and Dam functions as a critical node on the Illinois Waterway, facilitating commercial navigation for tows moving between the Chicago Harbor Lock and the LaGrange Lock and Dam. Barges carry commodities such as grain from Chicago Board of Trade-linked elevators, coal referenced to facilities near Cairo, Illinois, petroleum transported via inland waterways, and aggregate materials from Kankakee River-area quarries. Vessel movements are coordinated with Corps lockmaster offices and conform to rules adopted by the Inland River Record and regional marine pilots trained through programs associated with the U.S. Coast Guard and American Pilots' Association. Seasonal flows, ice cover influenced by National Oceanic and Atmospheric Administration forecasts, and dredging programs by the Corps affect lockage schedules.

Environmental and Ecological Impact

The creation and operation of the lock and dam have altered river hydrology and habitat structure within the Illinois River corridor, affecting species managed by the Illinois Department of Natural Resources and the U.S. Fish and Wildlife Service. Changes in sediment transport have implications for restoration projects tied to the Upper Mississippi River Restoration Program and for invasive species pathways monitored by the Great Lakes Commission and Aquatic Nuisance Species Task Force. The impounded pool supports wetland complexes used by migratory birds on the Mississippi Flyway, with ecological oversight involving the Audubon Society-affiliated sanctuaries and local Sierra Club chapters. Water quality issues involving nutrients and contaminants are addressed via cooperative programs with the Illinois Environmental Protection Agency, Environmental Protection Agency, and academic partners such as University of Illinois Urbana–Champaign and Illinois State University.

Recreation and Public Access

The vicinity provides recreational access that ties into Starved Rock State Park attractions, including hiking to sandstone canyons and viewing areas near the Illinois Valley overlook. Boating, fishing for species listed by the Illinois Department of Natural Resources such as channel catfish and smallmouth bass, and birdwatching draw visitors from Chicago, Peoria, Illinois, and Bloomington–Normal. Public facilities include Corps-managed boat ramps, parking linked to Illinois Route 351, and interpretive signage developed with partners like the National Park Service and local historical societies. Events and tourism promotion often involve collaboration among the LaSalle County Historical Society, regional chambers of commerce including the Peru Area Chamber of Commerce, and state tourism offices.

Category:Dams in Illinois Category:Locks of the United States Army Corps of Engineers