This is alist of secondary highways in Thunder Bay District, most of which serve aslogging roads or provide access to the isolated and sparsely populated areas in theThunder Bay District of northernOntario.

Highway 527
Route information
Maintained byOntario Ministry of Transportation
Length	235.1 km[1] (146.1 mi)
Existed	1950s[citation needed]–present
Major junctions
South end	Highway 17 inShuniah
North end	1st Avenue inArmstrong
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 526 →Highway 528

Secondary Highway 527, commonly referred to asHighway 527 is aprovincial maintained secondary highway in the Canadian province ofOntario. It is one of the longest secondary highways in the province; onlyHighway 599 is longer. Highway 527 spans a distance of 235.1 km (146.1 mi) from a junction withHighway 11 andHighway 17, theTrans-Canada Highway, in the community ofShuniah just outsideThunder Bay, to the small, remote community ofArmstrong and neighbouringWhitesand Indian Reserve.^[1]

TheGull Bay First Nation occupies one of the few permanent settlements on Highway 527, Gull Bay Reserve, situated on the western shore of Lake Nipigon about 70 kilometres south of Armstrong. The highway also passes the start ofHighway 811 along its route.

Highway 527 was created in the 1950s as a forest access road and designatedHighway 800 in 1963. Throughout the 1960s, the route was gradually extended until it reached what is now Highway 811 in 1969. The route was designated Highway 527 in 1976. Except within the communities of Armstrong and Gull Bay, there are no services or development along this road.

Highway 580
Route information
Maintained byMinistry of Transportation of Ontario
Length	12.5 km[1] (7.8 mi)
Existed	1956–present
Major junctions
West end	Poplar Lodge atLake Nipigon
East end	Highway 11 nearBeardmore
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 579 →Highway 581

Secondary Highway 580, commonly referred to asHighway 580 is asecondary highway in the Canadian province ofOntario. It is served to connect betweenHighway 11 nearBeardmore to Poplar Lodge near Lake Nipigon. It is also known as The Spruce River Road.

Highway 582
Route information
Maintained byMinistry of Transportation of Ontario
Length	6.4 km[1] (4.0 mi)
Major junctions
Southwest end	Highway 11 /Highway 17 /TCH –Thunder Bay
Northeast end	Highway 11 /Highway 17 /TCH –Nipigon
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Towns	Hurkett
Highway system
Ontario provincial highways Current Former 400-series
←Highway 581 →Highway 583

Highway 582 is a shortsecondary highway in the Canadian province ofOntario, which serves to connect the small community ofHurkett toHighway 17, the main route of theTrans-Canada Highway through the area.

Highway 582 is itself a former route of Highway 17, which was given its current number when a new alignment of Highway 17 between the two endpoints was later constructed.

Highway 584
Route information
Maintained byMinistry of Transportation of Ontario
Length	53.1 km[1] (33.0 mi)
Major junctions
South end	North ofGeraldton
North end	Warren Street inNakina
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Towns	Nakina,Geraldton
Highway system
Ontario provincial highways Current Former 400-series
←Highway 583 →Highway 585

Secondary Highway 584, commonly referred to asHighway 584 is asecondary highway in the Canadian province ofOntario. The southern terminus is north of the town ofGeraldton inGreenstone, while the northern terminus is at Warren Street inNakina, a length of 53.1 kilometres (33.0 mi). The road is signed as Michael Power Boulevard, First Avenue North, Third Street North, and Center Street.

Highway 585
Route information
Maintained byMinistry of Transportation of Ontario
Length	37.1 km[1] (23.1 mi)
Major junctions
South end	Highway 11 /Highway 17 /TCH nearNipigon, Ontario
North end	Pine Portage Hydroelectric Power Plant
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Towns	Nipigon,Cameron Falls,Pine Portage
Highway system
Ontario provincial highways Current Former 400-series
←Highway 584 →Highway 586

Highway 585 is a 36 kilometre road in theThunder Bay District ofNorthwestern Ontario, starting atTrans-Canada Highway11/17 inNipigon. It travels northward, parallel to theNipigon River, through the community ofCameron Falls to thePine Portage Hydroelectric Power Plant.

Highway 586
Route information
Maintained byMinistry of Transportation of Ontario
Length	5.2 km[1] (3.2 mi)
Existed	1956–present
Major junctions
West end	Dead end atShebandowan Lakes
East end	Highway 11 nearShebandowan
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 585 →Highway 587

Secondary Highway 586, commonly referred to asHighway 586 is asecondary highway in the Canadian province ofOntario. The western terminus is a dead end near the shores of theShebandowan Lakes, while the eastern terminus is at an intersection withHighway 11, a length of 5.2 kilometres (3.2 mi). The route was assigned in 1956, when Highway 11 was known asHighway 120.

Highway 587
Route information
Maintained byMinistry of Transportation of Ontario
Length	41.0 km[1] (25.5 mi)
Existed	1956–present
Major junctions
South end	Silver Islet loop inSleeping Giant Provincial Park
North end	Highway 11 /Highway 17 /TCH nearLoon
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 586 →Highway 588

Highway 587 is a secondary highway 40 kilometres away fromThunder Bay on theSibley Peninsula. It travels 15 kilometres in the Township Of Shuniah then 22 kilometres in theSleeping Giant Provincial Park. It begins at pass lake truck stop atHighway 11/Highway 17, and ends atSilver Islet, where it makes a 6 km (3.7 mi) loop around to connect with itself. Locations along the route includePass Lake, Silver Islet and a campground calledMarie Louise Lake Campground.

Highway 587 started out as a logging road in the 1800s and a connection to the silver mines atSilver Islet, Ontario.Later about the 1870s Sleeping Giant Provincial Park was incorporated and Highway 587 was in the planning stages. Finally about 1940 it was finished. The route was assumed as a provincial highway in 1956.

Highway 588
Route information
Maintained byMinistry of Transportation of Ontario
Length	54.0 km (33.6 mi)
Major junctions
West end	0.8 km (0.50 mi) west of McKechnie Road inNolalu
East end	Highway 11 /Highway 17 /TCH inOliver Paipoonge
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Major cities	Oliver Paipoonge,Whitefish River Valley
Highway system
Ontario provincial highways Current Former 400-series
←Highway 587 →Highway 589

Secondary Highway 588, commonly referred to asHighway 588, is aprovincially maintained highway in the Canadian province ofOntario, located inThunder Bay District.

Highway 588 is a 54.0-kilometre (33.6 mi) road in the Thunder Bay District ofNorthwestern Ontario, starting atTrans-Canada Highway11/17 inStanley, Ontario. It travels to approximately 10 kilometres west of the village of Suomi. The highway intersects withHighway 595 south ofHymers,Highway 590 inNolalu, andHighway 593 between Nolalu and Suomi.

•  Highway 590
•  Highway 593
•  Highway 595

Highway 589
Route information
Maintained byMinistry of Transportation of Ontario
Length	25.7 km (16.0 mi)
Major junctions
North end	Thunder Bay north limits
South end	Mary Lake Road nearJacques
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Major cities	Thunder Bay,Lappe
Highway system
Ontario provincial highways Current Former 400-series
←Highway 588 →Highway 590

Highway 589, also known asDog Lake Road, is a 31 kilometre road in theThunder Bay District ofNorthwestern Ontario, starting atHighway 102 (Dawson Road) inThunder Bay. It travels north toDog Lake. The highway intersects withHighway 591 inLappe.

• Highway 102
• Highway 591
• Lappe, Ontario

Highway 590
Route information
Maintained byMinistry of Transportation of Ontario
Length	23.7 km[1] (14.7 mi)
Existed	1956–present
Major junctions
South end	Highway 588 inNolalu
Major intersections	Highway 595
East end	Highway 11 /Highway 17 /TCH atKakabeka Falls
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Major cities	Kakabeka Falls,O'Connor,Gillies,Nolalu
Highway system
Ontario provincial highways Current Former 400-series
←Highway 589 →Highway 591

Highway 590 is a 26 kilometre road in theThunder Bay District ofNorthwestern Ontario, starting atTrans-Canada Highway11/17 inKakabeka Falls. It travels west for approximately 12 kilometres then turns due south to terminate atHighway 588 inNolalu. It intersects withHighway 595.

• Kakabeka Falls
• O'Connor
• South Gillies
• Nolalu

Highway 591
Route information
Maintained byMinistry of Transportation of Ontario
Length	7.8 km[1] (4.8 mi)
Existed	1956–present
Major junctions
South end	Highway 589 inLappe, Ontario
North end	Island Lake Road nearFowler
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Towns	Lappe, Ontario
Highway system
Ontario provincial highways Current Former 400-series
←Highway 590 →Highway 592

Highway 591 is an 8 kilometre road in theThunder Bay District ofNorthwestern Ontario, starting atHighway 589 inLappe. It travels west then north and terminates at the corners of Gilbride and Island Lake Roads, 8 kilometres (5.0 mi) northwest of Lappe.

Highway 593
Route information
Maintained byMinistry of Transportation of Ontario
Length	37.9 km[1] (23.5 mi)
Existed	1956–present
Major junctions
South end	Highway 61 near Canada–US border
North end	Highway 588 between Suomi andNolalu
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 592 →Highway 594

Highway 593 is a 52 kilometre road in theThunder Bay District ofNorthwestern Ontario, starting atHighway 61, three kilometres north of the Pigeon River border crossing at the Canada–US border. It travels west then north and terminates atHighway 588 between Suomi andNolalu.

Highway 595
Route information
Maintained byMinistry of Transportation of Ontario
Length	39.3 km[1] (24.4 mi)
Existed	1956–present
Major junctions
South end	Highway 597 nearPardee
Major intersections	Highway 608 atSouth Gillies  Highway 588 nearHymers
North end	Highway 590 west ofKakabeka Falls
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Towns	Gillies,Hymers
Highway system
Ontario provincial highways Current Former 400-series
←Highway 594 →Highway 596

Highway 595 is a 41 kilometre road in theThunder Bay District ofNorthwestern Ontario, starting atHighway 597, 22 kilometres southwest ofSouth Gillies. It travels west then north toHighway 590, 8 kilometres west ofKakabeka Falls. It intersects withHighway 588 south of Hymers andHighway 608 at South Gillies.

• Highway 588
• Highway 590
• Highway 597
• Highway 608
• Gillies
• Hymers

Highway 597
Route information
Maintained byMinistry of Transportation of Ontario
Length	15.3 km[1] (9.5 mi)
Major junctions
South end	Cloud Lake Road atPardee
Major intersections	Highway 595
North end	Highway 608 east ofSouth Gillies
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 596 →Highway 599

Highway 597 is a 15.3-kilometre (9.5 mi) road in theThunder Bay District ofNorthwestern Ontario, starting atHighway 595 in the Cloud Lake area. It travels north toHighway 608, east ofSouth Gillies.

Highway 608
Route information
Maintained byMinistry of Transportation of Ontario
Length	19.0 km (11.8 mi)
Major junctions
West end	Highway 595 atSouth Gilies
East end	Highway 61 atMoose Hill
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 607A →Highway 609

Secondary Highway 608, commonly referred to asHighway 608, is asecondary highway in theThunder Bay District ofNorthwestern Ontario, starting atHighway 595 in South Gillies. It travels 19.0 kilometres (11.8 mi) east toHighway 61, 5 km (3.1 mi) south ofHighway 130 inNeebing, Ontario at the community ofMoose Hill.

• Highway 597
• Highway 61
• Neebing, Ontario
• South Gillies

Highway 614
Route information
Maintained byMinistry of Transportation of Ontario
Length	51.8 km[1] (32.2 mi)
Existed	1956–present
Major junctions
South end	Highway 17 /TCH –Marathon,White River
North end	Adjala Avenue inManitouwadge
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 613 →Highway 615

Secondary Highway 614, commonly referred to asHighway 614, is asecondary highway in the Canadian province ofOntario, located inThunder Bay District. The route connectsHighway 17 (theTrans-Canada Highway) east ofMarathon with the mining town ofManitouwadge, where it ends at Adjala Avenue. The route is 51.8 kilometres (32.2 mi) in length.^[1] Highway 614 was assumed in early 1956.^[2][3]

Highway 625
Route information
Maintained byMinistry of Transportation of Ontario
Length	29.6 km[1] (18.4 mi)
Existed	April 17, 1958–present
Major junctions
South end	Tamarac Drive inCaramat
North end	Highway 11 /TCH nearLonglac
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 624 →Highway 627
Former provincial highways Highway 626 →

Secondary Highway 625, commonly referred to asHighway 625, is asecondary highway in the Canadian province ofOntario, located inThunder Bay District. The route begins at Tamarac Drive in the community ofCaramat. It travels north 29.6 kilometres (18.4 mi) and ends atHighway 11 (theTrans-Canada Highway) approximately 16 kilometres (9.9 mi) east ofLonglac.^[1] Highway 625 was assumed on April 17, 1958.^[4]

Highway 627
Route information
Maintained byMinistry of Transportation of Ontario
Length	13.2 km[1] (8.2 mi)
Existed	July 17, 1958–present
Major junctions
North end	Highway 17 /TCH nearMarathon
South end	Pukaskwa National Park nearPic River
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 625 →Highway 628
Former provincial highways ←  Highway 626

Secondary Highway 627, commonly referred to asHighway 627, is asecondary highway in the Canadian province ofOntario, located inThunder Bay District. The route begins at the visitor's centre forPukaskwa National Park, from which it travels north 13.2 kilometres (8.2 mi) to end atHighway 17 (theTrans-Canada Highway) just east ofMarathon.^[1] Highway 627 was assumed on July 17 and July 30, 1958, connecting Heron Bay with Highway 17.^[5]It was extended south through theOjibways of the Pic River First Nation to Pukaskwa National Park circa 1982.^[6]

Highway 628
Route information
Maintained byMinistry of Transportation of Ontario
Length	7.3 km[1] (4.5 mi)
Existed	July 28, 1961[7]–present
Major junctions
West end	Highway 11 /Highway 17 /TCH nearNipigon
East end	ReddittCNR station inRed Rock
Location
Country	Canada
Province	Ontario
Divisions	Thunder Bay District
Towns	Red Rock
Highway system
Ontario provincial highways Current Former 400-series
←Highway 627 →Highway 630

Secondary Highway 628, commonly referred to asHighway 628, is a 7.3-kilometre (4.5 mi)secondary highway in theThunder Bay District ofNorthwestern Ontario, starting atTrans-Canada Highway,Highway 11/Highway 17 approximately 11 kilometres (6.8 mi) southeast ofNipigon. It travels east to the town ofRed Rock.

Highway 628 was assumed by the Department of Highways, predecessor to theMinistry of Transportation on July 28, 1961.^[7]It remained unchanged from then until 2015, when construction began on four laning Highway 11/17 between Red Rock Road 9 and Stillwater Creek. The route was extended approximately 350 m (1,150 ft) west in June 2019 to the newly opened four lane highway.^[8]

Highway 643
Route information
Maintained byMinistry of Transportation of Ontario
Length	19.6 km[1] (12.2 mi)
Existed	November 7, 1963[9]–present
Major junctions
West end	Cavell Road nearAroland First Nation
East end	Highway 584 nearNakina
Location
Country	Canada
Province	Ontario
Districts	Thunder Bay District
Highway system
Ontario provincial highways Current Former 400-series
←Highway 642 →Highway 645
Former provincial highways Highway 644 →

Secondary Highway 643, commonly referred to asHighway 643, is asecondary highway in the Canadian province ofOntario, located inThunder Bay District. Its total length is approximately 19.6 kilometres (12.2 mi) and runs roughly on a northwest–southeast orientation. The northern terminus intersects Exton Road northwest ofAroland First Nation while the southern terminus intersectsHighway 584 nearExton. A proposed all-season access road would connectMarten Falls First Nation to Highway 643.^[10]

Highway 643 was assumed by the Department of Highways, predecessor to the modernMinistry of Transportation, in 1963. Although a short 1 km section within Danford Township was assumed on November 7, the majority of its length through Rupert Township and Exton Township was assumed on November 21.^[9]

• Ontario secondary highways

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