It would have brought in 5.4 billion dollars for MoDOT projects across Missouri.
MoDOT District Engineer Becky Baltz is disappointed with the outcome of Tuesday's election.
"There aren't really options or funding methods to get those projects completed, that's why Amendment 7 was so important," she said.
Voters said "no" to a 3/4 cent sales tax, which would have funded more than 100 transportation projects.
Those included new sidewalks, lane additions, and bus and air travel in Southwest Missouri.
"We know without additional funds we cannot complete those projects," Baltz said.
Amendment 7 was large in scope, 5.4 billion dollars over ten years.
Baltz said the agency will be playing defense without that additional revenue.
"We will focus on taking care of the existing system and keeping our highway and transportation system as safe as possible with the funds we have available," she said.
In Jefferson City, MoDOT officials are worried about the future of Missouri's infrastructure.
"There really is going to have to be another robust conversation about what is the solution for transportation funding in Missouri," MoDOT Director Dave Nichols said.
Nichols said it's now up to the legislature to decide how to move forward.
"We're going to keep pushing really, really hard to keep our highway system and our bridges in good condition for as long as we can with the dollars we have, but we're not going to be able to do it for long," he said.
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