Dewey Lake

{{short description|Lake near Prestonsburg, Kentucky}}

{{For|the lake in Minnesota|Dewey Lake (St. Louis County, Minnesota)}}

{{Use mdy dates|date=February 2025}}

{{Infobox body of water

| name = Dewey Lake

| image = Dewey_Lake.jpg

| caption = Lake and dam

| image_bathymetry =

| caption_bathymetry =

| location = Floyd County, Kentucky

| coords = {{coord|37|44|08|N|82|43|40|W|type:waterbody_region:US-KY|display=inline,title}}

| type = reservoir

| inflow = John's Creek

| outflow = John's Creek

| catchment =

| basin_countries = United States

| length =

| pushpin_map = Kentucky

| width =

| area = {{convert|1100|acre|km2|0}}

| depth = {{convert|40|ft|m|0}} {{Cite web | url=http://www.lakebrowser.com/kentucky/dewey_lake.asp |title = Fishing and Boating Dewey Lake Kentucky}}

| max-depth =

| volume=Maximum: {{Convert|93000|acre.ft|km3|abbr=on}}

| residence_time =

| shore =

| elevation = {{convert|196|m|order=flip|abbr=on}}{{gnis|490849}}

| islands =

| cities =

}}

Dewey Lake, located near Prestonsburg, Kentucky in Floyd County, is part of the integrated flood reduction system operated by the United States Army Corps of Engineers for the entire Ohio River Basin.{{cite web |url=https://www.lrh.usace.army.mil/Missions/Civil-Works/Recreation/Kentucky/Dewey-Lake/|title=Dewey Lake |publisher=United States Army Corps of Engineers |access-date=2020-04-05}}{{dead link|date=April 2025|bot=medic}}{{cbignore|bot=medic}}

The {{convert|1100|acre|km2|0|adj=on}} lake was formed by impounding John's Creek in 1949, and was named for Admiral George Dewey.{{cite book |editor=Kleber, John E. |others=Associate editors: Thomas D. Clark, Lowell H. Harrison, and James C. Klotter |title=The Kentucky Encyclopedia |year=1992 |publisher=The University Press of Kentucky |location=Lexington, Kentucky |isbn=0-8131-1772-0 |chapter=Lakes}} Dewey Dam (National ID # KY03029) is an earthen dam, {{convert|118|feet}} high. The length of the lake is {{convert|18.5|miles}} upstream from the dam and its water shed covers {{convert|207|sqmi}}.

Jenny Wiley State Resort Park is located on Dewey Lake.