USC’s streaks of seven straight BCS bowls, 11-win seasons, and top-four AP poll finishes? Those are all finished.

The Trojans’ Pac-10 dominance over the past seven years? It’s all but over after Stanford paved the way for a new West Coast champion.

Gerhart took time on the Coliseum field to savor the moment after rushing for 178 yards and three touchdowns in No. 25 Stanford’s 55-21 victory yesterday over the No. 11 Trojans, who allowed the most points in school history.

“To do that against a storied program, a perennial power, it’s the greatest feeling in the world,’’ said Gerhart, the Pac-10 rushing leader whose Heisman Trophy hopes are gaining momentum.

The loss was the Trojans’ worst since a 51-0 defeat at home against Notre Dame in 1966. Coach Pete Carroll lost in November for the first time at USC after 28 straight victories. And for the second time in three weekends, Carroll endured the worst loss of his nine seasons.

“I’m not sure I have the right words to describe being humbled like this,’’ Carroll said. “I don’t really know where to put it . . . We have fallen apart and given our opponents the opportunity to do whatever they want, but you have to give Stanford a lot of credit.’’

Andrew Luck threw two touchdown passes and ran for another score for the Cardinal (7-3, 6-2), who followed up their surprising rout of Oregon last week with a strong start and a big finish at the Coliseum. The Trojans (7-3, 4-3) haven’t lost to any other opponent at home since 2001, going 47-2.

Richard Sherman returned an interception 42 yards for a score with 11:41 to play, part of a 27-point fourth quarter for the Cardinal. After the postgame handshake, the Cardinal raised their helmets and raced to their cheering section for their second celebration at the Coliseum in three years.

Stanford’s 24-23 victory as a 41-point underdog in 2007 was a major shocker, yet this win barely even qualified as an upset. And the Cardinal did it on USC’s homecoming, no less, in front of 90,071 somnolent fans.

“Once we got rolling, we kept doing good things,’’ said Luck.

Florida 24, South Carolina 14 - Tim Tebow tied the SEC career TD record with his 53d, a 1-yard run in the fourth quarter that sealed the No. 1 Gators’ first perfect league record in 13 years.

Florida (10-0, 8-0) relied on its SEC-leading defense to save things against former coach Steve Spurrier, who looked like he’d figured out Florida’s front line.

Down, 17-14, South Carolina (6-5, 3-5) drove 48 yards to Florida’s 22. But defensive lineman Justin Trattou intercepted Stephen Garcia and brought it back 53 yards. Tebow cashed in four plays later, matching the TD record set by LSU’s Kevin Faulk. He also threw for an early TD.

Texas 47, Baylor 14 - Colt McCoy tied the NCAA record for career victories by a starting quarterback, throwing two TD passes to pace the second-ranked Longhorns in Waco, Texas.

McCoy is 42-7 with Texas (10-0, 6-0 Big 12), tying the wins record set by former Georgia quarterback David Greene. McCoy had scoring tosses of 3 and 7 yards to lead the Longhorns to a 40-0 lead at halftime. McCoy left the game midway through the third quarter with 181 yards on 23-of-34 passing.

Alabama 31, Mississippi St. 3 - Mark Ingram had a 70-yard TD run in the fourth quarter to highlight his 149-yard outing, and the No. 3 Crimson Tide improved to 10-0 for the second straight year by blasting the host Bulldogs.

Mark Barron snagged his fifth and six interceptions of the season, most in the SEC. The Alabama offense matched the defense big play for big play, and did it without a turnover or penalty, a good way for the Tide (7-0 SEC) to keep momentum with two games left before the conference title game against Florida.

TCU 55, Utah 28 - In likely their last significant hurdle to an undefeated regular season, the fourth-ranked Horned Frogs (10-0, 6-0 Mountain West) scored three TDs in a 2 1/2-minute span early in the second quarter to blow away the No. 16 Utes (8-2, 5-1) in Fort Worth.

Matthew Tucker had the first and last TDs (runs of 41 and 9 yards) for TCU, with five teammates getting into the end zone in between. The 55 points were the most allowed by Utah since 1996.

Boise St. 63, Idaho 25 - Kellen Moore tied his career high with five TD passes, four to Austin Pettis, and Titus Young had a 100-yard kickoff return as the No. 6 Broncos (10-0, 5-0 WAC) kept their BCS hopes alive by beating the visiting Vandals.

Pittsburgh 27, Notre Dame 22 - The No. 8 Panthers improved to 9-1 by holding off the Fighting Irish (6-4) in Pittsburgh. Dion Lewis’s 50-yard TD run gave Pitt a 27-9 lead with 12:44 left, but Notre Dame rallied behind Golden Tate, who had an 18-yard TD catch and an 87-yard punt return for a score less than two minutes later.

LSU 24, Louisiana Tech 16 - Keiland Williams ran for 116 yards and two second-half TDs, helping the ninth-ranked Tigers (8-2) fend off the upset-minded Bulldogs (3-7) in Baton Rouge, La.

Central Florida 37, Houston 32 - At Orlando, Fla., Brynn Harvey ran for three TDs as the Golden Knights (6-4, 4-2 Conference USA) kept Houston star quarterback Case Keenum in check and upset the No. 13 Cougars (8-2, 4-2).

Oklahoma St. 24, Texas Tech 17 - The No. 17 Cowboys (8-2, 5-1 Big 12) relied on their defense to beat the visiting Red Raiders (6-4, 3-3), getting a 21-yard interception return for a TD by Patrick Lavine.

California 24, Arizona 16 - Playing without star running back Jahvid Best (concussion), the host Golden Bears (7-3, 4-3 Pac-10) knocked off the No. 18 Wildcats (6-3, 4-2) behind four field goals by Giorgio Tavecchio.

Penn St. 31, Indiana 20 - Linebacker Navorro Bowman had a momentum-turning 73-yard interception return for TD and Evan Royster scored twice as the No. 19 Nittany Lions (9-2, 5-2 Big Ten) survived a sloppy performance at home.

Wisconsin 45, Michigan 24 - Scott Tolzien tied a career high with four TD passes, two going to Nick Toon, and the No. 21 Badgers (8-2, 5-2 Big Ten) routed the visiting Wolverines (5-6, 1-6).

BYU 24, New Mexico 19 - Max Hall had two TD passes in tying Ty Detmer’s school record with his 29th career victory, but the No. 22 Cougars (8-2, 5-1 Mountain West) struggled to put away the winless Lobos in Albuquerque.