A bridge that had to win over investors
When the Mackinac Bridge opened on November 1, 1957, Michigan gained a fixed road crossing between its two peninsulas. Getting the project financed had proved almost as important as designing the span. A proposed bond sale failed to attract enough support in March 1953. Legislators then offered to cover up to $417,000 of annual operating and maintenance costs through gasoline and vehicle-license taxes. Another financing attempt failed in June. Only after the market improved late that year did investors buy the $99.8 million bond issue. [1]
The arrangement brought future toll receipts into the present: investors supplied construction money before a single driver could pay to cross. The authority’s financing account makes a useful distinction. The bonds had a face amount of $99.8 million, but proceeds to the authority were about $96.4 million. Construction cost approximately $70.3 million and design another $3.5 million. Remaining proceeds helped service the borrowing during and after construction. A bridge price and a bond issue therefore describe different things. [2]
From ferries to a construction site
Michigan began a state ferry service in 1923. A 1934 bridge authority failed to secure federal public-works support; war interrupted the effort and legislators abolished it in 1947. A new authority followed in 1950. Engineer David B. Steinman designed the eventual bridge, and construction formally began in May 1954. [1]
Construction itself had to be paid for before toll income existed. Once the crossing opened, travelers provided the anticipated revenue stream, but operating the facility and paying creditors remained different calls on that money. [2]
The state paid to lower the price of crossing
The next important change was a deliberate reduction in tolls. Under legislation enacted in 1967, Michigan authorized $3.5 million annually from January 1969 through January 1986 toward bond principal, interest and related costs. Legislators intended to bring the passenger-car toll down from $3.75 to as close as possible to $1.50. The authority implemented the reduction on January 1, 1969. The lower charge did not make the bonds disappear; state money supported their repayment while drivers paid less at the booths. [3]
Those transfers were advances rather than an unconditional erasure of the project’s costs. The statute also required continued toll collection after the bonds were paid until advances were repaid. Later toll increases addressed a different phase of the bridge’s life: truck fares changed in 1995, with further increases in 2003, 2008, 2010 and 2012 to help meet expenses. [3]
What remained after the original bonds
By 1986, the original bond obligation had ended. The authority’s historical account dates final bond retirement to July 1 that year. Yet the bridge still had to be staffed, inspected and repaired, and its relationship with state transportation funds continued. Paying off outside investors was a milestone in a much longer public-finance arrangement. [1]
The fiscal-2025 audited financial statements disclose two separate sets of advances. Operating reimbursements totaled $12,306,172, with none repaid. Debt-service advances totaled $63 million, of which $18,306,172 had been repaid by September 30, 2025. The authority paid $250,000 toward that second balance in fiscal 2025. Its finance committee determines repayment amounts with maintenance, operations and major future work in mind. [4]
The statements do not record these advances as liabilities, explaining that repayment depends on future net revenue and is long-term and budgetary. That accounting treatment does not say the historical advances were forgiven. The same report records $24.43 million in operating revenue, $14.38 million in operating expenses and $4.44 million in investment income for fiscal 2025. Those annual flows fund an institution whose responsibilities extend far beyond a single year’s traffic. [4]
Why drivers still encounter a toll booth
The published schedule now charges a standard passenger car $4, or $2 per axle. Vehicles outside the passenger classification generally pay $5 per axle. The distinction includes vehicles such as tractor-trailers and motor homes; it is not simply a single price for everything that crosses. The schedule describes the charge for using the crossing, rather than a remaining installment on the original construction bonds. [5]
Traffic reports show why vehicle counts and revenue need to be read separately. In April 2026, the authority reported 233,951 crossings, 1.2% fewer than a year earlier, while toll revenue fell 3.6%. The release also described tolls and fees as its funding source for operating, maintaining and protecting the bridge. That statement concerns the crossing’s user-funded operation; the audited accounts separately disclose investment and lease income. A monthly traffic comparison is consequently neither an annual profit measure nor evidence that every category of revenue moves with car counts. [6]
Keeping the crossing open is a continuing project
The authority’s maintenance program includes replacing sections of open deck grating, repairing structural steel and removing and renewing paint in selected areas. Its project page places those activities across the 2024–2026 seasons. These are concrete examples of what preservation means: work on the roadway people use and on the structure supporting it. They are recurring and staged activities, rather than evidence that the whole bridge is being rebuilt at once. [7]
A May 15, 2025 project notice illustrates the practical constraints. Cold and rain delayed repaving and replacement of a modular joint, extending lane closures. The authority had already narrowed that season’s scope in hopes of reopening all lanes before Memorial Day; remaining southbound deck repairs and paving were to become a separate later project. Similar northbound work in 2024 had continued into mid-June. These notices describe particular jobs and schedules, not a final price for all future rehabilitation. [8]
The authority also says it is saving for an eventual deck replacement estimated at several hundred million dollars. That is a prospective preservation need, not a newly verified construction contract. The bridge’s financial story has thus moved from finding investors to building the crossing, lowering tolls with state advances, retiring bonds and paying for a long-lived asset. The booths remain because the structure’s useful life continues to generate costs. [2]
Sources
- Mackinac Bridge Authority, History of the BridgeSourceBack to text: ↑1↑2↑3
- Mackinac Bridge Authority, frequently asked questions: financing, construction and future deckSourceBack to text: ↑1↑2↑3
- Mackinac Bridge Authority, fiscal-2013 audited statements, Note 3Official source · PDFBack to text: ↑1↑2
- Mackinac Bridge Authority, fiscal-2025 audited statements, statement of revenue and Notes 3–4Official source · PDFBack to text: ↑1↑2
- Mackinac Bridge Authority, toll schedule, checked October 6, 2026SourceBack to text: ↑
- Mackinac Bridge Authority, April 2026 traffic report, released May 22, 2026Source · PDFBack to text: ↑
- Mackinac Bridge Authority, preservation project scheduleSourceBack to text: ↑
- Mackinac Bridge Authority, weather delays joint replacement, May 15, 2025Source · PDFBack to text: ↑