{{Short description|State highway in southeastern Ohio, US}} {{Use American English|date=April 2025}} {{Use mdy dates|date=January 2025}} {{Infobox road |state=OH |type=SR |route=821 |map=OH 821 map.svg |maint=ODOT |length_mi=48.85 |length_round=2 |length_ref=<ref name="SLD_821WAS">{{cite web |url=http://www.odotonline.org/techservapps/SLD/pdf_files/wassr0821r.pdf |title=Technical Services Straight Line Diagrams: SR&nbsp;821, Washington County |author=Ohio Department of Transportation |author-link=Ohio Department of Transportation |access-date=2011-09-22 |archive-url=https://web.archive.org/web/20120507030001/http://www.odotonline.org/techservapps/SLD/pdf_files/wassr0821r.pdf |archive-date=2012-05-07 |url-status=dead }}</ref><ref name="SLD_821NOB">{{cite web |url=http://www.odotonline.org/techservapps/SLD/pdf_files/nobsr0821r.pdf |title=Technical Services Straight Line Diagrams: SR&nbsp;821, Noble County |author=Ohio Department of Transportation |access-date=2011-09-22 |archive-url=https://web.archive.org/web/20120507030012/http://www.odotonline.org/techservapps/SLD/pdf_files/nobsr0821r.pdf |archive-date=2012-05-07 |url-status=dead }}</ref><ref name="SLD_821GUE">{{cite web |url=http://www.odotonline.org/techservapps/SLD/pdf_files/guesr0821r.pdf |title=Technical Services Straight Line Diagrams: SR&nbsp;821, Guernsey County |author=Ohio Department of Transportation |access-date=2011-09-22 |archive-url=https://web.archive.org/web/20120507030017/http://www.odotonline.org/techservapps/SLD/pdf_files/guesr0821r.pdf |archive-date=2012-05-07 |url-status=dead }}</ref> |established=1971<ref name=ODOT1969_map /><ref name=ODOT1971_map /> |direction_a=South |terminus_a={{jct|state=OH|OH|60}} near Marietta |junction={{jct|state=OH|I|77}} near Marietta<br>{{jct|state=OH|I|77}} in Belle Valley |direction_b=North |terminus_b={{jct|state=OH|I|77|OH|209|CR|35|county3=Guernsey}} in Byesville |counties=Washington, Noble, Guernsey |previous_type=SR |previous_route=814 |next_type=SR |next_route=822 }}

'''State Route&nbsp;821''' ('''SR&nbsp;821''') is a north&ndash;south state highway in the southeastern portion of the U.S. state of Ohio. A state-maintained section of the old US 21, its southern terminus is at SR 60 approximately {{convert|2|mi}} north of Marietta, and its northern terminus is at I-77 in Byesville, along with the eastern terminus of SR&nbsp;209. The route is entirely undivided surface road, and is much less direct than the newer I-77 which supplanted it as a through route. As the interstate was being built, the designation of US 21 was moved to the freeway before Ohio wholly decommissioned the now-superfluous U.S. route. SR 821 was designated about two years after US 21 was moved onto I-77 in southeastern Ohio.

==Route description== left|thumb|SR&nbsp;821 north in Muskingum Township from SR&nbsp;60 Along its path, SR&nbsp;821 passes through central portions of Washington County and Noble County, and into the southern part of Guernsey County. No segment of the route is included as a part of the National Highway System (NHS). The NHS is a network of highways identified as being most important for the economy, mobility and defense of the nation.<ref name="NHS">{{cite map | title=National Highway System: Ohio | date=December 2003 | publisher=Federal Highway Administration | url=http://www.fhwa.dot.gov/planning/nhs/maps/oh/oh_Ohio.pdf | archive-url=https://web.archive.org/web/20081016165827/http://www.fhwa.dot.gov/planning/nhs/maps/oh/oh_Ohio.pdf | url-status=dead | archive-date=October 16, 2008 | format=PDF|access-date=2011-09-22}}</ref>

{{Expand section|date=September 2011}}

==History== SR&nbsp;821 was created in 1971. The designation was applied to what was the former routing of US&nbsp;21 between Marietta and Byesville, prior to the completion of I-77 through the area by 1969. At the time, when the US&nbsp;21 designation was removed from Ohio in favor of I-77, this stretch of roadway was removed from the state highway system. However, by 1971, it was introduced back into the system, and was given the designation of SR&nbsp;821, based on its routing along the old path of US&nbsp;21.<ref name=ODOT1969_map>{{cite map |title=Official Ohio Highway Map |url=http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1969a.sid |format=MrSID |publisher=Ohio Department of Highways |date=1969 |cartography=ODOH |access-date=2011-09-22}}</ref><ref name=ODOT1971_map>{{cite map |title=Ohio Highway Map |url=http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1971a.sid |format=MrSID |publisher=Ohio Department of Highways |date=1971 |cartography=ODOH |access-date=2011-09-22}}</ref><ref name=ODOT1967_map>{{cite map |title=Official Ohio Highway Map |url=http://www.dot.state.oh.us/Divisions/TransSysDev/Innovation/prod_services/Documents/StateMaps/otm1967a.sid |format=MrSID |publisher=Ohio Department of Highways |date=1967 |cartography=ODOH |access-date=2011-09-22}}</ref>

==Major intersections== {{OHinttop|length_ref=<ref name="SLD_821WAS"/><ref name="SLD_821NOB"/><ref name="SLD_821GUE"/>}} {{OHint |county=Washington |cspan=4 |ctdab=Washington |township=Muskingum |lspan=2 |mile=0.00 |road={{jct|state=OH|OH|60|city1=Marietta|city2=Lowell|city3=Beverly}} }} {{OHint |mile=3.12 |road={{jct|state=OH|I|77|city1=Marietta}} |notes=Exit 6 (I-77)}} {{OHint |ctdab=Washington |township=Salem |lspan=2 |mile=10.36 |road={{jct|state=OH|OH|145|dir1=north|city1=Stafford|city2=Lewisville|name1=Main Street}} |notes=Southern terminus of SR&nbsp;145}} {{OHint |mile=11.57 |road={{jct|state=OH|OH|530|dir1=West|city1=Lowell}} |notes=Eastern terminus of SR&nbsp;530}} {{OHint |county=Noble |cspan=7 |ctdab=Noble |township=Jefferson |mile=20.96 |road={{jct|state=OH|OH|339|dir1=South|city1=Beverly}} |notes=Northern terminus of SR&nbsp;339}} {{OHint |ctdab=Noble |township=Olive |mile=28.33 |road={{jct|state=OH|OH|78|to2=yes|I|77|city1=McConnelsville|city2=Woodsfield}} }} {{OHint |location=Caldwell |mile=29.66 |road={{jct|state=OH|OH|285|dir1=North|city1=Sarahsville|name1=Planning Mill Street}} |notes=Southern terminus of SR&nbsp;285}} {{OHint |ctdab=Noble |township=Noble |mile=32.38 |road={{jct|state=OH|OH|215|dir1=East|city1=Sarahsville}} |notes=Western terminus of SR&nbsp;215}} {{OHint |location=Belle Valley |mile=32.84 |road={{jct|state=OH|I|77}} |notes=Exit 28 (I-77)}} {{OHint |township=Noble |ctdab=Noble |mile=33.52 |road={{jct|state=OH|OH|340|dir1=West|city1=Cumberland}} |notes=Eastern terminus of SR&nbsp;340}} {{OHint |ctdab=Noble |township=Buffalo |mile=39.81 |road={{jct|state=OH|OH|672|dir1=West}} |notes=Eastern terminus of SR&nbsp;672}} {{OHint |county=Guernsey |cspan=5 |ctdab=Guernsey |township=Valley |lspan=3 |mile=42.60 |type=concur |road={{jct|state=OH|OH|146|dir1=East|name1=West Main Street|road|Pleasant Road}} |notes=Southern end of SR 146 concurrency}} {{OHint |mile=42.73 |type=concur |road={{jct|state=OH|OH|146|dir1=West}} |notes=Northern end of SR 146 concurrency}} {{OHint |mile=44.07 |road={{jct|state=OH|OH|313|city1=Chandlersville|location2=Buffalo}} }} {{OHint |location=Byesville |lspan=2 |mile=48.13 |type=concur |road={{jct|state=OH|OH|209|dir1=West|name1=Main Street|road|North 2nd Street}} |notes=Southern end of SR 209 concurrency}} {{OHint |mile=48.85 |type=concur |road={{jct|state=OH|I|77|location1=Cleveland|CR|35|county2=Guernsey|name2=Vocational Road}} |notes=Northern end of SR 209 concurrency; exit 41 (I-77)}} {{Jctbtm|keys=concur}}

==See also== {{Portal|Ohio|U.S. Roads}} * List of state highways in Ohio

==References== {{Reflist|22em}}

==External links== {{Attached KML|display=title,inline}} {{commons category-inline|Ohio State Route 821}}

821 821 821 821 Category:U.S. Route 21