Bill Arch's 6-yard touchdown run with 30 seconds left broke a 14-14 tie and lifted No. 12-seed Springdale (8-2) to a 21-14 upset at Monessen (7-3) last night.

The Greyhounds had tied the game earlier in the quarter on a Terrance Stepoli touchdown pass and two-point conversion, but Monessen had no answer for the Springdale ground attack.

The Dynamos racked up 318 of their 354 yards rushing. Arch (145 rushing yards) and Sean Dugan (111) led the way for Springdale.

Rochester strung together three touchdowns of 65-plus yards in the first half as the top-seeded Rams made easy work of visiting Carmichaels (4-6). Jasson Adamson scored on a 66-yardrun, hooked up with Trey Johnson for a 68-yard touchdown pass and Terrence Slade returned an interception 97 yards for a touchdown in the first half.

Five Spartans scored as No. 2-seed Laurel (9-1) ran over over visiting Burgettstown (4-6). Laurel piled up 339 yards rushing with 163 of those yards coming from Dylan Jones. Laurel outgained the Blue Devils, 422-81, in total yards.

The Bears' dominance continued as No. 3-seed Clairton (9-1) routed South Side Beaver (6-4). Deon Ellis returned the opening kickoff 77 yards for a touchdown. The Bears were up, 47-0, at halftime, and they outgained the Rams, 426-38, in total yards.

North Catholic junior quarterback Martin Long accounted for four consecutive touchdowns as the Trojans (8-2) rolled to a victory against Jefferson-Morgan (7-3) at J.C. Stone Field. Long hooked up with Alex Kline, Kory Gribbin and Bill Frizzi for touchdown passes, then broke loose for a 34-yard score. Julian Durden carried the load on the ground for North Catholic, gaining 108 yards.

Ninth-seeded Brentwood (6-4) entered the WPIAL playoffs as one of the hottest teams in Class A. The Spartans stayed that way, piling up a shutout at Fort Cherry (7-3).

Cory Bauer found Danny Lucas for two touchdown passes, a 22-yard connection in the second quarter and a 84-yard touchdown in the third.

A 21-point third quarter was all that quarterback Sal Fiaeta and host Beth-Center needed to pull away as host Beth-Center (8-2) beat Serra (7-3).

Fiaeta had two touchdown passes and a touchdown run in the third quarter. Opening the second half with a 17-10 lead, Fiaeta scored on a 16-yard run before throwing touchdown passes to DeShan Brown and Jeremy Price.

Avonworth senior Jimmy Zubik accounted for 229 of Avonworth's 361 total yards and three of its four touchdowns and the No. 6-seeded Antelops' defense shutout Monaca (5-5), which played its last football game before it merges with Center next year.

Zubik scored on runs of 48 and 72 yards and a 79-yard pass reception from Tom Turnbull.

Mike White's "High School Sports Edition" videos are featured exclusively on PG+, a members-only web site from the Pittsburgh Post-Gazette. Our introduction to PG+ gives you all the details.