HOOD RIVER, Ore. -- A wildfire that started Tuesday evening about two miles east of Hood River grew to over 50 acres by Wednesday morning.

Called the Milepost 66 Fire, the blaze shut down Interstate 84 eastbound to one lane, causing delays of up to 20 minutes.

Photos: Gorge wildfire

The cause was under investigation.

The fire was difficult for crews to fight on the steep terrain along I-84, officials said. Crews are fighting the fire from the ground, as well as with helicopters and planes dropping retardant and water.

Homeowner Bill Nelson was spraying down his house, hoping that will help protect his belongings in case the flames reach his property.

Whether it's going to get to my house or not, we are probably half a mile from the top of the fire, Nelson said.

A trail for bicyclists and hikers on an abandoned highway between Hood River and Mosier was also closed as a precaution, due to the fire.

A warning went out Wednesday afternoon, alerting people with respiratory conditions that the air quality was diminishing, due to the wildfire. People with problems were encouraged to go into an air conditioned building, and avoid strenuous exercise outdoors, if possible.

More: Air Quality Alerts

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