{{short description|State highway in Minnesota, United States}} {{Use American English|date=April 2025}} {{Use mdy dates|date=January 2025}} {{Infobox road| state=MN | type=MN | route = 66 |map={{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=240|type=line|raw={{Wikipedia:Map data/Wikipedia KML/Minnesota State Highway 66}}}} |map_custom=yes |map_notes=MN 66 highlighted in red | established = 1963 | decommissioned = June 30, 2016<ref name=MFP2014/>| length_mi = 12.059 | length_ref = <ref name=logpoint7/> |section=115 |subsection=187 | |direction_a=South |terminus_a={{jct|state=MN|CSAH|1|CSAH|10|county1=Blue Earth|county2=Blue Earth}}<br>near Good Thunder |direction_b=North |terminus_b={{jct|state=MN|US|169|MN|60}} at Mankato |counties=Blue Earth | previous_type=MN | previous_route=65 | next_type=MN | next_route=67 }} '''Minnesota State Highway 66''' ('''MN&nbsp;66''') was a highway in south-central Minnesota, which ran from its intersection with Blue Earth County Roads 1 and 10 near Good Thunder and continued north to its northern terminus at its interchange with U.S. Highway 169 / State Highway 60 in the city of Mankato. The highway is currently known as '''Blue Earth County Road 1''' (CSAH 1).

Highway 66 was {{convert|12|mi|km}} in length.

==Route description== Highway 66 served as a north&ndash;south route between Mankato and Good Thunder in south-central Minnesota, although it did not actually enter the latter city.<ref name=citymap>{{cite map |url=http://www.dot.state.mn.us/maps/cadd/city/Under5000/blueearth1.pdf |title=Municipalities of Blue Earth County |publisher=Minnesota Department of Transportation |year=2010 |accessdate=October 25, 2010 |url-status=dead |archiveurl=https://web.archive.org/web/20120908011748/http://www.dot.state.mn.us/maps/cadd/city/Under5000/blueearth1.pdf |archivedate=September 8, 2012 }}</ref>

Highway 66 followed Carney Avenue in the city of Mankato.

The route passed near the town of Skyline, adjacent to Mankato.

Highway 66 crossed the Le Sueur River, south of Mankato.

The route paralleled the Maple River near Good Thunder.

The highway was legally defined as Legislative Route 256 in the Minnesota Statutes.<ref name=161.115>{{cite web |url=https://www.revisor.mn.gov/statutes/?id=161.115 |title=161.115, Additional Trunk Highways |work=Minnesota Statutes |publisher=Office of the Revisor of Statutes, State of Minnesota |date=2010 |accessdate=October 25, 2010}}</ref> It was not marked with this number.

==History== Highway 66 was created in 1963. It was originally numbered ''State Highway 256'' from 1949 to 1963.<ref name=riner>{{riner |route=66 |access date=October 25, 2010}}</ref> The route was removed from statute in 2013;<ref>{{cite web |title=Chapter 127--S.F.No. 1270 |url=https://www.revisor.mn.gov/laws/?doctype=Chapter&year=2013&type=0&id=127 |at=Sec. 67 |date=May 24, 2013 |work=Minnesota Session Laws - 2013, Regular Session |publisher=Minnesota Office of the Revisor of Statutes |access-date=March 24, 2020}}</ref> on June 30, 2016, Highway 66 was removed from the state highway system, becoming an extension of CSAH 1.<ref name=turnback>{{cite web |url=https://www.dot.state.mn.us/govrel/reports/2018/2018-turnback-program-report.pdf |title=Report on the Jurisdictional Transfer (Turnback) Program |date=February 2018 |publisher=Minnesota Department of Transportation}}</ref><ref name=MFP2014>{{cite web |url=https://www.mankatofreepress.com/news/local_news/blue-earth-county-agrees-to-take-over-highway/article_51e043d4-e886-510d-811f-bcbfd1633af2.html |archive-url=https://web.archive.org/web/20200302044328/https://www.mankatofreepress.com/news/local_news/blue-earth-county-agrees-to-take-over-highway/article_51e043d4-e886-510d-811f-bcbfd1633af2.html |url-status=dead |title=Blue Earth County agrees to take over Highway 66 |first=Dan |last=Linehan |work=Mankato Free Press |date=October 7, 2014 |archive-date=March 2, 2020}}</ref>

Paving (while marked 256) on the route began in 1948 and was completed in 1950.<ref name=CS0715>{{cite web |url=http://www.dot.state.mn.us/roadway/data/docs/projlog/county07/0715.pdf |title=Construction Project Log Record: Control Section 0715 |publisher=Minnesota Department of Transportation |access-date=March 24, 2020}}</ref>

==Major intersections== {{Jcttop |state=MN |county=Blue Earth |length_ref=<ref name=logpoint7>{{cite web |url=http://www.dot.state.mn.us/roadway/data/reports/logpoint/d7.pdf |title=Trunk Highway Log Point Listing - Construction District 7 |format=PDF |publisher=Minnesota Department of Transportation |date=August 23, 2010 |accessdate=October 25, 2010 |archive-url=https://web.archive.org/web/20081204174552/http://www.dot.state.mn.us/roadway/data/reports/logpoint/d7.pdf |archive-date=December 4, 2008 |url-status=dead }}</ref> |former=yes}} {{MNint |location=Lyra Township |mile=0.000 |road={{jct|state=MN|CSAH|1|CSAH|10|county1=Blue Earth|county2=Blue Earth}} |notes=Southern terminus }} {{MNint |location=Rapidan Township |lspan=2 |mile=4.498 |road={{jct|state=MN|CSAH|35|county1=Blue Earth}}}} {{MNint |mile=6.502 |road={{jct|state=MN|CSAH|9|county1=Blue Earth}}}} {{MNint |location=Mankato |mile=12.010 |mile2=12.080 |road={{jct|state=MN|US|169|MN|60}} |notes=Northern terminus; interchange}} {{jctbtm}}

==References== {{Attached KML|display=title,inline}} {{reflist}}

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