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| Lock and Dam No. 15 | |
|---|---|
| Name | Lock and Dam No. 15 |
| Location | Rock Island, Illinois / Davenport, Iowa |
| Waterway | Mississippi River |
| Built | 1936–1939 |
| Builder | United States Army Corps of Engineers |
| Owner | United States Army Corps of Engineers |
| Reservoir | Pool 15 |
| Dam type | Concrete and earthen gravity dam with tainter gates |
| Purpose | Navigation, flood control |
Lock and Dam No. 15 is a major navigation structure on the Mississippi River near Rock Island, Illinois and Davenport, Iowa. Administered by the United States Army Corps of Engineers, it forms Pool 15 and supports commercial navigation, regional industry, and riverine ecosystems. The facility links inland water transport with the broader Missouri River and Ohio River systems and sits within a corridor shaped by Mississippi River Basin development, New Deal era public works, and interstate commerce.
Lock and Dam No. 15 creates a regulated pool used by towboats, barges, and recreational craft transiting between upper and lower reaches of the Mississippi River. Located downstream of the Upper Mississippi River National Wildlife and Fish Refuge, the site interfaces with urban centers including Rock Island, Moline, Illinois, Davenport, Iowa, and Bettendorf, Iowa. The complex supports industries connected to the Saint Louis–area freight network, links to railroads such as the BNSF Railway and Union Pacific Railroad, and functions within federal frameworks overseen by the United States Army Corps of Engineers Districts.
Planning and construction occurred in the context of 1930s river improvement programs inspired by the Muscle Shoals debates and the Public Works Administration. The project was authorized under New Deal–era legislation and executed by the United States Army Corps of Engineers between 1936 and 1939, contemporaneous with projects at Lock and Dam No. 14 and Lock and Dam No. 16. Construction mobilized regional labor and equipment supplied through firms associated with the Tennessee Valley Authority and other Corps contracts. The timeframe overlapped with broader infrastructural milestones such as the Bonneville Dam and the Hoover Dam efforts, reflecting federal priorities in flood control and inland navigation.
The structure comprises concrete lock chambers, movable tainter gates, and earth embankments similar to designs employed at Keokuk Lock and Dam and Melvin Price Locks and Dam (Lock and Dam No. 26). The main lock accommodates standard commercial tows used on the Upper Mississippi River, while auxiliary gates regulate flow and pool elevation. Mechanical systems were originally powered by mid-20th century electro-mechanical drives and have been upgraded in phases paralleling modernization at Lock and Dam No. 11 and Lock and Dam No. 19. The site includes service buildings and a lockmaster’s quarters designed in an era akin to Civilian Conservation Corps projects and architectural motifs seen at National Park Service properties.
Operations are conducted by Corps personnel who coordinate lockages for commercial barge tows, private vessels, and transient craft. Lock scheduling adapts to seasonal variations influenced by tributaries like the Des Moines River and events such as spring runoff tied to the Upper Mississippi River Basin Floods. The lock facilitates links in commodity chains that move grain from Iowa terminals to ports such as New Orleans and connects to inland logistics nodes including Chicago and St. Louis. Coordination with the United States Coast Guard and river pilot associations ensures navigation safety, while maintenance activities align with Corps regional asset management used at sites like La Crosse, Wisconsin and Dubuque, Iowa.
Creation of Pool 15 altered riparian habitats and sediment regimes, affecting species recognized by the United States Fish and Wildlife Service and conservation bodies operating in the Upper Mississippi River National Wildlife and Fish Refuge. Changes in flow and backwater areas influenced populations of pelagic and benthic species, interlinking with studies by institutions such as the University of Iowa, Iowa State University, and the Illinois Natural History Survey. Environmental management balances navigation with mitigation measures similar to those developed under the Clean Water Act and collaborative programs with the Environmental Protection Agency. Invasive species issues, notably those paralleling concerns about the Asian carp invasion, require monitoring, while habitat restoration efforts echo projects at Pool 9 and Pool 13.
The lock and adjacent reservoir attract anglers, birdwatchers, and paddlers drawn by species lists curated by organizations such as Audubon Society chapters and local parks departments. Public access points link to trails and parklands in Rock Island County and Scott County, Iowa, and are served by municipal amenities in Moline and Davenport. Recreational boating, competitive rowing programs affiliated with universities like Augustana College (Illinois) and river festivals in Quad Cities communities utilize the river corridor while cooperating with the Corps on safety advisories and educational outreach.
Throughout its operational life the facility has experienced incidents typical of major locks: mechanical failures, towgroundings, and storm-related impacts that have prompted temporary closures and coordinated emergency responses with agencies including the Federal Emergency Management Agency and state authorities of Illinois and Iowa. Historic events include flood responses during the 1943 Mississippi Floods and later major flood years when Corps operations at this and neighboring locks were critical to regional resilience. Notable maintenance campaigns and modernization projects have been conducted in tandem with federal infrastructure initiatives and oversight from congressional delegations representing Illinois's congressional districts and Iowa's congressional districts.
Category:Locks on the Mississippi River Category:United States Army Corps of Engineers projects Category:Buildings and structures in Rock Island County, Illinois Category:Buildings and structures in Scott County, Iowa