Gov. Gretchen Whitmer is expected to address the "magnitude" of the problems plaguing Michigan's crumbling roads and infrastructure in her first State of the State address Tuesday night.

"I'm going to talk about the magnitude of the issue," Whitmer told The Associated Press on Monday. "Bridges that have hundreds of temporary supports holding them up, potholes that are taking money away from family budgets for rent or child care, the incredible harm it does to our ability to keep the edge in mobility and to draw investment into Michigan."

The nonpartisan Senate Fiscal Agency spelled out the magnitude in black-and-white in two sentences in a little-noticed nine-page memo to lawmakers last month:

"While the 2015 road funding package provided a substantial amount of revenue, and the percentage of roads in good condition have improved, both the magnitude and the timing of the funding did not prevent many roads from degrading to poor condition. As a result, not only do the roads need more revenue but they will require more revenue than in 2015 to address the situation."

In other words, the price tag to achieve Whitmer's campaign pledge to "fix the damn roads" is going up.

The Senate Fiscal Agency's report, titled "The Rising Costs of Road Repair," is a sobering assessment of how the $1.2 billion road-funding plan signed into law by former Gov. Rick Snyder in late 2015 has not stemmed the tide of rapidly deteriorating roadways (which can be confirmed by anyone who drives 10 Mile Road in Macomb or Oakland counties).

"Michigan's roads now require an additional $2 billion dollars annually to fix because there are 20 percent more roads in poor condition today than there were in 2015," SFA analyst Michael Siracuse and chief economist David Zin wrote.

The 2015 plan to pump $1.2 billion more annually into Michigan's roads and bridges is still two years away from being fully funded. And that's the problem, the Senate Fiscal Agency analysts say.

While the fiscal agency recognizes the Republican-controlled Legislature is spending a record amount on roads, the road repairs can't come fast enough to make up ground lost by years of stagnant funding followed by years of debate in Lansing (workgroups have been studying this issue since 2011).

This is illustrated by the chart below from the Michigan Department of Transportation showing how the new investment in roads has prolonged the majority of trunkline roads being rated in good or fair condition until 2026 instead of this year as originally projected.