Senate Majority Leader Harry ReidHarry ReidChris Murphy’s profile rises with gun tragedies Republicans are headed for a disappointing end to their year in power Obama's HHS secretary could testify in Menendez trial MORE (D-Nev.) announced a deal with Republicans on Wednesday that paves the way for a final vote on a bill to fund federal transportation projects through next spring.

The deal will allow votes on an alternative bill offered by Sens. Barbara BoxerBarbara BoxerTrump riles Dems with pick for powerful EPA job Pelosi's chief of staff stepping down Time is now to address infrastructure needs MORE (D-Calif.), Tom CarperThomas (Tom) Richard CarperOvernight Energy: Dems take on Trump's chemical safety pick Dems lambaste Trump’s ‘outrageous’ EPA chemical safety pick Infrastructure spending bill sliding down agenda MORE (D-Del.) and Bob CorkerRobert (Bob) Phillips CorkerDeficit hawks voice worry over direction of tax plan The Hill Interview: Budget Chair Black sticks around for now Overnight Finance: White House requests B for disaster relief | Ex-Equifax chief grilled over stock sales | House panel approves B for border wall | Tax plan puts swing-state Republicans in tough spot MORE (R-Tenn.) that would fund the federal Highway Trust Fund only until Dec. 31.

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It also sets up a vote on amendments offered by Sens. Mike LeeMichael (Mike) Shumway LeeWhatever you think the Alabama special election means, you’re probably wrong How the effort to replace ObamaCare failed Overnight Regulation: Trump temporarily lifts Jones Act for Puerto Rico | Bill would exempt some banks from Dodd-Frank | Senators unveil driverless car bill MORE (R-Utah) and Pat Toomey (R-Pa.).

A final vote on the underlying House bill, which is backed by the White House, could come Thursday.

The House bill would provide $10.9 billion to fund projects. It would use a number of offsets to pay for the costs of the bill. Without action by Congress, the fund would have gone bankrupt next month, ending funding for projects. 

“Allowing the Highway Trust Fund to run dry would slam the breaks on critical infrastructure projects across the land,” Senate Finance Committee Chairman Ron WydenRonald (Ron) Lee WydenHouse bill set to reignite debate on warrantless surveillance Senate confirms No. 2 spot at HHS, days after Price resigns Overnight Cybersecurity: Equifax CEO faces outraged lawmakers | Dem presses voting machine makers on cyber defense | Yahoo says 3 billion accounts affected by 2013 breach MORE (D-Ore.) said. “It is nonnegotiable that Congress is going to prevent that from happening.”

The trust fund gets its money from the 18.4 cents per gallon gas tax, which has struggled to keep up with the need for infrastructure spending projects as cars grow more fuel-efficient.

Most of the costs of the House bill are offset through "pension smoothing," which some senators in both parties have derided as a budget gimmick. Those senators want to only extend funding until December so that Congress is under pressure to work on a long-term highway bill after the midterm elections.

“Many claim that budget gimmicks should not be used as offsets to pay for spending.” Corker said. “I have long been against the disgraceful practice of spending money today and paying for it in the future. It’s shameful, it’s irresponsible, and it’s generational theft.”

— Keith Laing contributed to this article.