PORTLAND -- The summer travel season is ending in Oregon and Southwest Washington on a high note but not in a good way.

Tropical Storm Isaac, combined with high demand for gas and recent refinery problems has bumped up the price of gas in the Northwest, yet again.

The high-volume travel centers located along I-84 were advertising prices at $3.89 a gallon but in Portland, many gas stations were above $4.

More: Find the cheapest gas in your area

And as what is now Tropical Storm Isaac brews into a hurricane, a shutdown of gulf oil production was expected soon.

We have about 20 percent of US oil that is produced in the Gulf. So it s a big chunk that goes across the country and it adds to an already tight situation, said Marie Dodds, with the American Automobile Association.

Experts said this will likely cause gas prices to climb even more.

It s horrible, you know. I m not driving as much, I m retired but still 50. If you have to do anything to go anywhere it s impossible to do, one driver told KGW as he filled up his tank.

The average price of gas on Monday in Portland was $3.98 a gallon. The state average was $4.01, according to AAA.

It does make it tough, but at the end of the day, what can we really do? said driver David Schacher.

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