PORTLAND, Ore. -- Oregon gas prices fell to their lowest level in 11 weeks Tuesday.

The average price of a gallon of gas in Oregon is $4.06, compared to the national average of $3.87.

"If the price of crude oil remains below $125 per barrel, we could see a national average around $3.75 by Labor Day," said Marie Dodds, AAA Oregon Public Affairs director. "Larger declines will be in the works if oil prices plunge even lower than they are now."

Oil is trading at about $120 per barrel, down about $27 from the all-time high price of $147 per barrel set on July 11.

Despite the drop, prices at the pumps are still much higher than they were a year ago. At this time last year, gas cost $2.87 per gallon in Oregon.

Oregon gas prices are 10th highest in the nation. Alaska has the most expensive gas in the country with an average of $4.65 per gallon. Hawaii, California, Utah and New York round out the top five.

The cheapest gas in the country can be found in Oklahoma, where the average price of a gallon is $3.61.