Robby Walsh's 16th-minute goal from the left gave the Indians a lead and, despite Gladstone's late rain of fire, the defense remained unbroken.
Scappoose held for a 1-0 decision and its first 2-0 overall start in coach Scott Stanton's six-year tenure on Tuesday at Scappoose Middle School's Chinook Field.
The Tribe had not played in 13 days because of wildfires and smoky air across Oregon and Washington, and emerged from Tuesday with North Bend and Cascade as one of three Class 4A teams without a goal given up.
The Indians' 12 goals scored also became the state's fifth-best.
"We talked about having games and we got ready for having games, then we wouldn't have games," Stanton said.
The Tribe broke a streak of five losses to the Gladiators (1-3) by an average of three goals and a pair of ties since 2010, even after Gladstone junior forward Mitchell Kuhn received a 34th-minute penalty kick that nailed the left post past Mikey Reed's outstretched arms and sailed above the goal on the second-chance point-blank rebound.
"I will admit I started to panic, as I think a lot of my team did, when Gladstone started getting a lot of shots off," said Walsh, a senior forward. "Yet after we started to calm down, I noticed how we were able to slow down their offense and control them more. I'm proud of how my team was able to step up their level of play and get the win."
The Gladiators fired and fired and fired in the second half, but shots veered left and right of the net.
"I think we did really well," said Reed, a junior. "We were quick to recognize when they were about to shoot, and did a good job playing out of the back to draw them in then switching the field to create more scoring opportunities. All in all, we did really well. I am extremely happy whith how our team is moving along."
Caden Verzino and the Indians' quick midfielders spun out of tricky two-on-ones and kept the ball from Gladstone's forwards.
"We worked on pressure in one-on-one situations, where it's coming from on the sides and how to get out of it," Stanton said.
Walsh's final-minute shot skittered across the Gladiators goal but curved just outside the left post.
Scappoose's next test is a 6 p.m. game with Class 3A/2A/1A De La Salle Catholic scheduled for Friday at Delta Park in Portland.
"They're a private school, so they can swing drastically from one year to the next [after missing the postseason last season]," Stanton said.