POLSON, Mont. — Braced on the deck of a 30-foot aluminum research vessel, four local high school students bent to the task of measuring the temperature, acidity and other characteristics of sparkling-blue Flathead Lake.

So intent were they on their instruments, they appeared oblivious to the seemingly endless sky above this largest freshwater body, by surface area, in the American West, and the dramatic northern Rocky Mountains that surround it.

In addition to collecting useful data on the fragile ecosystem, the purpose of this visit to the University of Montana’s Flathead Lake Biological Station was to entice the students to go on to college and expand their own horizons.

But there’s a broader campaign being waged in this state, not just to encourage high schoolers to consider college, but to persuade increasingly skeptical voters that they should continue paying for it.

Montana residents are alone in the nation in being required to weigh in every 10 years on whether to allot a portion of their property taxes to support their public universities and colleges. While they’ve said “yes” every decade since the question started being asked in 1948, the margin has been narrowing, and this year’s vote comes at a time of growing antagonism toward both academia and taxes.

That makes Montana’s so-called 6-mill levy a referendum not just on one state’s local property tax rate, but on the national mood toward higher education.

“We’ve got demographic shifts that are way bigger than Montana — a slowing birthrate, we have the online revolution providing more and more options for students, and competing uses for tax dollars,” said Republican Rep. Tom Burnett of Bozeman, who opposes the levy.

“Every one of those dollars that goes into investment for higher education has to come from some other place,” Burnett said. “The taxpayer has to decide which is the best use.”

This could be a problem for colleges and universities, about which a slew of opinion polls suggest Americans take a dim view at a time of campus speech controversies, athletic scandals, high dropout rates, sexual harassment and assault, comparatively generous pay for faculty and administrators and complaints about the competence of graduates.

A poll by WGBH News/Abt Associates, conducted in August, found that while 78 percent of Americans would be concerned if their states cut funding for higher education, fewer than half are willing to pay more taxes to support it.

Republicans in particular have come to hold a negative view of colleges and universities, the Pew Research Center reported in a survey in July. Seventy-three percent of Republicans and Republican-leaning independents held a poor opinion of higher education, up from 37 percent just three years earlier. The WGBH News poll found lower levels of negative opinion among self-identified Republicans, not including independents who lean toward the party.

“There is a general distrust toward institutions, and higher education is one of them,” said Michael Nietzel, former president of Missouri State University and author of the new book “Coming to Grips with Higher Education,” which takes universities to task for being inefficient, focusing too much on the wrong priorities and other problems.

Voters “think that colleges and universities are too liberal, they don’t teach students to be critical thinkers, they don’t teach students the right material,” said Nietzel. “We have given some ammunition to the critics by failing to address some of these perennial problems.”

Enthusiasm for Montana’s higher education property tax levy has been eroding for a while. It passed with 64 percent of the vote in 1988, 61 percent in 1998 and less than 57 percent in 2008. That was despite a Montana State University poll ahead of the election showing 69 percent support.

This time around, a University of Montana poll found that 71 percent of Montanans would vote to continue taxing themselves for higher education. But an earlier poll conducted for the Montana Board of Regents suggested the proportion could be as low as 48 percent, meaning that the referendum wouldn’t pass.

“You don’t know for sure how those Trump voters will go,” said Bob Brown, the Republican former secretary of state and Senate president who now is treasurer of the pro-levy Montanans for the Six Mill. The state favored Donald Trump for president in 2016 by more than 20 percentage points, though it simultaneously elected a Democratic governor, Steve Bullock. “They’re against the status quo, or at least it seems they are. Just the fact that the public is in the mood it’s in makes you a little bit concerned.”

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Montana Gov. Steve Bullock supports continuing a property tax levy that pays for higher education.
Kirk Carapezza WGBH News

If the levy faces a steep slog, it’s mostly because of anti-tax sentiment, said Bullock, who also supports the referendum.

“We live in this world … of — we call it tax relief, right? — cutting taxes that ought to be paying for the essential services that people expect,” said Bullock, in an open-collared shirt and cowboy boots in the state capitol building’s dark-paneled Governor’s Reception Room. “The opponents who turn around and say we’re overspending, those are often the same people who say we’re overspending on our schools, we’re overspending on our roads.”

The levy adds $12 a year to a homeowner’s property tax bill for every $100,000 worth of value; the median home price in Montana is $225,100, on which the tax would add $27.01 per year.

That would raise $19 million in the first year, and about $200 million over the 10 years until the next referendum, the Montana University System estimates — a rounding error for some public and elite private universities’ budgets, but about 10 percent of Montana’s.

Losing this money “would be transformational in the negative sense in terms of our ability to continue to provide a high-quality, accessible education,” said University of Montana President Seth Bodnar, a former Green Beret still in his first year on the job and already overseeing big budget cuts in response to an ongoing enrollment decline on his campus. “And I think it would be an obviously very dismaying and troubling indication of this country’s focus.”

If the levy fails, the university system warns, tuition could increase by 17 to 18 percent.

“That’s a lot,” said Annabelle Smith, a junior political science major at the University of Montana who already works part time to pay for school. “It’s super tough to be a student and to afford stuff. Books are ridiculously expensive.” The price of campus parking just went up.

“A lot of students aren’t going to be able to keep going to college,” said Kelly Armington, a University of Montana freshman majoring in communication studies. “I’m extremely hopeful it will pass, because I honestly don’t know what I’m going to do if it doesn’t.”

The state chamber of commerce, AFL-CIO, Montana Farm Bureau and Montana Economic Developers Association are among the unlikely allies in support of the levy.

The principal voice against it, Montanans Against Higher Taxes, splashes photos on its Facebook page of partying students and rails against what it says are liberal faculty, useless courses, campus drug use, high salaries for deans, corporate interests that support the referendum because they profit from students, and a decision to block a conservative speaker from an event at the University of Montana.

Customers of every political stripe at Shellie’s Country Cafe off U.S. Highway 12 in the state capital of Helena said their opposition to the higher education levy stems from all the things they think are wrong with colleges and universities.

Dennis Mallory, 77, a retiree who describes himself as a “bleeding-heart liberal” and who meets with friends at Shellie’s every Tuesday morning at 10, said he was particularly frustrated that some students graduate from Montana public universities only to move away and take their taxpayer-subsidized skills to Denver or Seattle.

“It’s much, much too expensive, and we can’t afford any more property tax,” said Mallory as a waitress delivered orders of eggs and chicken-fried steak from the serving window over which hung a list of the day’s homemade pies.

His friend Larry Johns, 77, a retired real estate agent, said universities and colleges have failed to keep up with the times as states such as Montana shift from mining and agriculture to industries including technology, health care and alternative energy.

“Our higher education institutions are in desperate need of modifying and adjusting to the changes, and they’re not,” said Johns. Instead, he said, graduates “get a degree, the kid gets on the street and he goes to McDonald’s and he flips burgers. For what we’re paying for, we’re not getting our money’s worth.”

(Eighty-eight percent of recent graduates from Montana State University were employed full or part time in 2016, the last year for which the figures are available, according to officials; the University of Montana couldn’t supply its placement rate. The state Department of Labor reports that 69 percent of college graduates stay in Montana and find work within a year of finishing college, and 74 percent within five years.)

Johns volunteered another reason for not wanting to pay more taxes to support Montana’s colleges and universities: He already spent $120,000 to send his two daughters through them.

Both are gainfully employed, one as a mathematician and the other as a teacher, Johns said. “But I’ve got friends and acquaintances, the kids went to school, they paid money and their kids are sitting in their basement. They’re just not up to speed.”

He said he’d prefer that universities train doctors or people who want to work in high tech, “and forget about Mozart and all that type. They can pick that up after school somewhere. I don’t want to pay for that.”

It’s a complaint likely shared by other parents angry that the cost of higher education has significantly outpaced inflation. At public universities and colleges, paradoxically, that’s at least in part because of falling state appropriations.

Ten years after the most recent recession, states are collectively spending $7 billion less on public higher education, when adjusted for inflation, than they did in 2008, according to the Center on Budget and Policy Priorities.

Burnett and others argue that cutting state appropriations should force institutions to be more efficient. In fact, they’ve passed the costs along to students. Tuition nationwide at four-year colleges has increased 36 percent, on average, since 2008.

Voters have continued to give mixed signals about their willingness to pay more for higher education.

Though ballot questions allowing for more money for public universities have passed since 2012 in California, Maine, New Jersey, New Mexico and Rhode Island, Mainers also nixed $11 million for labs and other improvements at that state’s public universities and community colleges. Arizona voters gave a decisive no to continuing a 1-cent sales tax to pay for public colleges and universities, among other things. In Missouri, a tax increase on cigarettes and other tobacco projects was voted down; it would have generated money for K-12 and higher education.

Oregon voters resoundingly defeated a proposal requiring a fund be set up to help residents pay for college. In Alaska, voters turned down using money from already approved bonds to make more student loans available. Oklahomans by a wide margin rejected a 1-percentage-point increase in the sales tax that would have helped pay for K-12 and higher education.

This year, in addition to Montana’s 6-mill levy, voters will consider authorizing bonds for higher education facilities in Rhode Island, New Mexico and Maine.

To win back public support, “It’s really important for those of us who love higher education to say, ‘Hey, we need to get our house in order,’” said Nietzel. “I’m optimistic that they can; I’m pessimistic that they will.”

If that doesn’t happen, he said, “Certainly you are running the risk of further public disinvestment. You don’t feel that next year. You feel it five or 10 years from now, when other countries are moving ahead of us in terms of inventions and in terms of technology and suddenly we’re wondering, ‘How come we’re no longer dominant in higher education?’”

Written story by Jon Marcus, radio story by Kirk Carapezza. Esteban Bustillos also contributed to this story.

This story about higher education funding was produced by The Hechinger Report, a nonprofit, independent news organization focused on inequality and innovation in education.