FIREFIGHTERS STRUGGLED WEDNESDAY TO STOP A 2,450-ACRE (980-HECTARE) WILDFIRE FROM JUMPING A HIGHWAY IN SCENIC OAK CREEK CANYON AND ROARING INTO AN AREA OF EVACUATED HOMES AND RESORTS, ACCORDING TO AP. NEARLY 600 FIREFIGHTERS WERE ON THE LINES WEDNESDAY, BACKED BY AT LEAST A DOZEN AIRCRAFT AND NEARLY THREE-DOZEN FIRE TRUCKS, BUT THE BLAZE WAS ONLY 5 PERCENT CONTAINED IN THE STEEP, RUGGED TERRAIN. FLAMES APPROACHED THE CANYON'S TWO-LANE HIGHWAY IN PLACES DURING THE NIGHT BUT CREWS WERE ABLE TO LIGHT BACKFIRES TO REMOVE FUEL FROM ITS PATH, OFFICIALS SAID WEDNESDAY MORNING. «THIS IS A GOOD START. WE'VE GOT A REAL GOOD CHANCE OF HOLDING THE LINE,» SAID LARRY SEARS, THE DIVISIONAL COMMANDER WHO LEAD THE BACKFIRE OPERATION TEAM. THE FIRE WAS APPROACHING THE AREA OF SLIDE ROCK STATE PARK, A POPULAR RECREATION SPOT THAT DRAWS HUNDREDS OF THOUSANDS OF VISITORS A YEAR. IF IT JUMPS THE HIGHWAY «THEN IT'S A WHOLE NEW BALL GAME FOR TRYING TO CATCH THE FIRE,» SAID SEARS. OFFICIALS SAID THE FIRE COULD BE DRAWN UP THE OTHER SIDE OF THE CANYON AND INTO THICK WILDERNESS. THE FIRE STARTED SUNDAY AS A CAMPFIRE AND SPREAD QUICKLY, FORCING THE EVACUATION OF ABOUT 400 HOMES AND BUSINESSES IN THE CANYON MORE THAN 90 MILES (145 KILOMETERS) NORTH OF PHOENIX. RESIDENTS OF 180 HOMES ON THE NORTH SIDE OF SEDONA, WHO WERE EVACUATED SUNDAY, WERE GOING TO BE ALLOWED TO RETURN WEDNESDAY, SAID INCIDENT COMMANDER PAUL BROYLES. ELSEWHERE, CREWS IN COLORADO BATTLED AN 8,960-ACRE (3,580-HECTARE) WILDFIRE THAT FORCED THE EVACUATION OF MORE THAN 300 HOMES. U.S. 160 THROUGH THE AREA WAS CLOSED WEDNESDAY FOR A THIRD DAY. LIGHTER WIND, LOWER TEMPERATURES AND SLIGHTLY HIGHER HUMIDITY WERE FORECAST FOR THE AREA. «IT WILL BE A COOL, MOIST SURGE» MOVING IN WEDNESDAY NIGHT, SAID NATIONAL WEATHER SERVICE METEOROLOGIST KATHY TORGERSON. THE COLORADO FIRE, IGNITED BY LIGHTNING AND REPORTED SUNDAY, WAS ABOUT 150 MILES (241 KILOMETERS) SOUTH OF DENVER. IN SANTA MARIA, CALIFORNIA, FIREFIGHTERS BATTLED A 10,000-ACRE (4000-HECTARE) BLAZE THAT HAD STOPPED SHORT OF A CRITICAL RIDGE LINE IN LOS PADRES NATIONAL FOREST. WILDFIRES HAVE CHARRED MORE THAN 3.1 MILLION ACRES (1.24 MILLION HECTARES) NATIONWIDE SO FAR THIS YEAR, WELL AHEAD OF THE AVERAGE OF ABOUT 900,000 ACRES (360000 HECTARES) BY THIS TIME, THE NATIONAL INTERAGENCY FIRE CENTER REPORTED. HUGE GRASS FIRES THAT SWEPT TEXAS AND OKLAHOMA THIS SPRING ACCOUNT FOR MUCH OF THE INCREASE.