Lock and Dam No. 25

{{Short description|Lock and dam near Winfield, Missouri}}

{{Use American English|date=January 2025}}

{{Use mdy dates|date=August 2023}}

{{Infobox dam

| name =

| image = Mississippi River Lock and Dam number 25 large.jpg

| image_size = 250px

| image_caption = Mississippi River Lock and Dam No. 25

| name_official =

| dam_crosses = Upper Mississippi River

| res_name = Pool 25

| location = Richwood Precinct, Calhoun County, Illinois / Burr Oak Township, Lincoln County, Missouri,
near Winfield, Missouri, USA

| operator = 24px U.S. Army Corps of Engineers, St. Louis District

| dam_length = {{convert|1296|ft|m|1}}

| dam_height =

| dam_width_base =

| construction_began = 1935

| opening = May 18, 1939

| res_capacity_total = {{convert|176000|acre feet|km3|abbr=on}}

| res_catchment = {{convert|142000|mi2|km2|abbr=on}}

| res_surface = {{convert|18000|acre|km2}}

| coordinates = {{coord|39|00|17|N|90|41|11|W|region:US_type:landmark|display=inline,title}}

| extra = {{Infobox NRHP

| nocat = yes

| embed = yes

| name = Lock and Dam No. 25 Historic District

| nrhp_type = hd

| image =

| caption =

| location = 10 Sandy Slough Rd., Winfield, Missouri

| locmapin = Missouri#USA

| built = 1939

| architect = US Army Corps of Engineers; Griffin, Almern Frederick

| architecture =

| added = March 10, 2004

| area = {{convert|316.4|acre}}

| mpsub = Upper Mississippi River 9-Foot Navigation Project MPS

| refnum = 04000184{{NRISref|version=2010a}}

}}

}}

Lock and Dam No. 25 is a lock and dam located near Winfield, Missouri, on the Upper Mississippi River around river mile 241.4. The movable portion of the dam is {{convert|1296|ft|m|1}} long and consists of three roller gates and 14 tainter gates. A {{convert|2566|ft|m|1}} submersible dike extends to the Illinois shore. A {{convert|5|mi|km|1}} long dike is part of the facility extending upstream on the Missouri side of the river. The main lock is {{convert|110|ft|m|1}} wide by {{convert|600|ft|m|1}} long.[https://web.archive.org/web/20161019172038/http://www.mvs.usace.army.mil/Missions/Navigation/Locks-and-Dams/Lock-Dam-25/ Lock and Dam No. 25 - U.S. Army Corps of Engineers] In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 25 Historic District, #04000184 covering {{convert|3164|acre|km2|1}}, 2 buildings, 7 structures, 2 objects.

align="center" |File:Lock and dam 25.jpeg |File:Lock and dam 25.png