M-21 followed Oak and Griswold Streets east to M-25 (Military Street) originally. When Interstate 69 was designated between Flint and Port Huron in 1984, the non-freeway portion of M-21 along these streets was redesignated as Business Spur I-69. The spur was changed to Business Loop I-69 by 1987 when M-25 was truncated northward and replaced with Business Loop I-94 through both Port Huron and Marysville.1
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| A small sign directs motorists along Business Loop I-69/94 (Military Street) northward two miles for the Blue Water Bridge east into Canada. 11/06/11 |
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| Military Street north at Court Street on the southern outskirts of Downtown Port Huron. Court Street leads east to Vantage Point on the St. Clair River. 11/06/11 |
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| Two blocks further north in the Port Huron business district at Pine Street. 11/06/11 |
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| Military Street kinks eastward from Water Street to span the Black River. 11/06/11 |
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| The Military Street Bridge, a double leaf bascule bridge, was constructed in 1990-91 to replace a 1913 span at the same location.3 11/05/11 |
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| Quay Street intersects Business Loop I-69/94 east immediately north of the Black River. 11/05/11 |
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| Military Street becomes Huron Avenue north of Quay Avenue. Business Loop I-69/94 east next meet Grand River Avenue. 11/05/11 |
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| McMorran Boulevard links Business Loop I-69/94 east with Keifer Park along the St. Clair River and St. Clair Community College to the west. 11/05/11 |
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| Business Loop I-69/94 follow Huron Avenue five blocks to the five-way intersection with Glenwood and Pine Grove Avenues. 11/05/11 |
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| Heading northwest, Pine Grove Avenue passes by Port Huron Hospital to the west and Pine Grove Park to the east between Kearney Street and Prospect Place. 11/05/11 |
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| Another set of shields for Business Loop I-69/94 east are posted at Pine Grove Avenue north at Sedgwick Street. 11/05/11 |
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| A five-way intersection with Thomas Street west and north-south Stone Street follows. 11/05/11 |
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| 10th Avenue crosses paths with Business Loop I-69/94 (Pine Grove Avenue) at Scott Avenue. A number of business and homes were demolished from this intersection northward to I-69/94 as part of the 2011-12 expansion project for the freeway leading east to the Blue Water Bridge. 11/05/11 |
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| A set of weathered reassurance markers for Business Loop I-69/94 east precede the new eastbound off-ramp from I-69/94 to Pine Grove Avenue (former M-25). 11/05/11 |
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| Pine Grove Avenue passes under the customs facilities for the Blue Water Bridge ahead of Elmwood Street and the eastbound on-ramp to Sarnia, Ontario. 11/05/11 |
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| A loop ramp circles eastward to join I-69/94 east ahead of the Blue Water Bridge toll plaza. The tandem transition into Highway 402, a freeway east to Highway 401 at London, Ontario. 11/05/11 |
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| Although already beyond the return point for I-69/94 east, Business Loop I-69/94 east continue a short distance to Hancock Street west. 11/05/11 |
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| Hancock Street carries Business Loop I-69/94 west to the freeway connector leading south to I-69/94 west. 11/05/11 |
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| M-25 takes over for Business Loop I-69/94 along Pine Grove Avenue north toward Lexington along the Lake Huron shoreline. 11/05/11 |
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| Nearing the south split of Business Loop I-69/94 (Military Street) west at Griswold Street. Business Loop I-69 turns west 3.2 miles to I-69/94. 11/06/11 |
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| Business Loop I-69 west provides direct access to Interstate 69 west from Port Huron to Flint and Lansing in addition to access for I-94 southwest to Detroit. 11/06/11 |
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| The 2.8 mile overlap between Business Loop 69/94 west from Pine Grove Avenue near Garfield Street concludes at Griswold Street. Griswold Street carries Business Loop I-69 west, one block north of eastbound along Oak Street. 11/06/11 |
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| A pair of shields for Business Loop I-69 reside at the Griswold Street intersection with 6th Street, one block removed from Business Loop I-94. 11/06/11 |
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| 10th Street constitutes a north-south through street between Business Loop I-94 by St. Joseph Mercy Hospital and the Black River bridge near Haynes Park. 11/06/11 |
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| Westbound Business Loop I-69 (Griswold Street) at 11th Street. 11/06/11 |
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| 16th Street heads south from Business Loop I-69 to a large industrial park south of the Canadian National Railroad and Business Loop I-94 (Electric Avenue / Military Street). 11/06/11 |
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| Signage for Business Loop I-69 west remains consistent with another pair of shields posted at 17th Street. 11/06/11 |
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| 24th Street is the last street crossing the CN Railroad line to south Port Huron from Business Loop I-69 (Griswold Street). The arterial street continues north to Memorial Park, a number of shopping centers and Lapeer Road near the Lapeer Connector to I-69/94. 11/06/11 |
 2 photos 2 photos | Four blocks of the Griswold and Oak Street couplet remain as Business Loop I-69 prepares to leave the Port Huron street grid for an expressway connector to the west split of I-69/94. 11/06/11 |
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| The final reassurance marker for Business Spur I-69 precedes the split with Griswold Street west. 11/06/11 |
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| Angling northwest along an expressway, Business Spur I-69 intersects 32nd Street. 32nd Street stems north from Griswold Street to a nearby shopping center and Lapeer Road. 11/06/11 |
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| A pair of junction shields for I-69 accompany freeway entrance only signs as the expressway leaves 32nd Street. 11/06/11 |
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| An Interstate 69 west shield takes the place of Business Loop I-69 west as the expressway elevates to pass over an abandoned railroad line. 11/06/11 |
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| Business Loop I-69 provides access to Interstate 94 west before merging onto I-69 west ahead of Flint. 11/06/11 |
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| Approaching the wye interchange with I-69/94 west on Business Loop I-69 west. Construction kicked off on September 30, 2013 involving a $76 million project to rebuild 3.7 miles of I-69/94 west from Lapeer Road, including the interchange with Business Loop I-69. Work is scheduled through late 2015.2 11/06/11 |
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| One half mile out from the connecting ramp to Interstate 94 west for Detroit. 11/06/11 |
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| A left side ramp departs for I-94 west as two lanes of Business Loop I-69 west merge onto Interstate 69 west. 11/06/11 |
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| An I-94 exit number references the Business Loop I-69 transition onto I-69 west. I-69/94 split at a three-wye interchange to the left. It was replaced with a new directional ramp further west as part of the 2013-15 road work. 11/06/11 |
Page Updated 10-23-2013.
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