Hundreds of people gathered on Portland's Burnside Bridge at midnight July 1, 2015, to celebrate the start of legal recreational marijuana in Oregon. The party, dubbed the "Burnside Burn," was organized by Portland's chapter of the National Organization for the Reform of Marijuana Laws. Christina Belasco / OPB Participants gathered in the narrow pedestrian pathway, awaiting a marijuana seed giveaway and overflowed onto the road, causing traffic jams in both directions of the Burnside Bridge. Christina Belasco / OPB Though Oregon voters approved the legalization measure last November, the law didn't official take effect until Wednesday. Christina Belasco / OPB Recreational stores could open as early as Oct. 1. Christina Belasco / OPB Partiers celebrate the legalization of recreational marijuana in Oregon, July 1, 2015. Christina Belasco / OPB One man gave out free THC droplets to strangers in the crowd. Christina Belasco / OPB Officers from Portland's police department were present at the event, though no serious trouble escalated. Christina Belasco / OPB The National Organization for the Reform of Marijuana Laws gave out a limited number of marijuana plants and seeds to the crowd that gathered near the Burnside Bridge in Portland. In the end a miniscule amount of participants walked away with the greenery. Christina Belasco / OPB The crowd celebrates as the clock strikes 12 and marijuana officially became legalized in Oregon. Christina Belasco / OPB A man smokes a marijuana joint as others gather to celebrate the legalization of recreational pot in Oregon. Christina Belasco / OPB Stragglers held on well past midnight to see if more marijuana would circulate. Christina Belasco / OPB 

The clock struck midnight Wednesday and smoke began to pour from the Burnside Bridge as recreational marijuana became legalized for the first time in Oregon.

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Pot connoisseurs, advocacy groups and first-time users gathered at the bridge to celebrate the legalization of marijuana at a free party, sponsored by Portland marijuana activists.

Organizers estimated the crowd in the thousands, as the iconic "Portland, Oregon" sign sparkled in the background and many sparked up at midnight. Though Oregon voters approved the legalization measure last November, the law didn't officially take effect until Wednesday.

"I was waiting until it was legalized, and then I thought I'd try it," said Robert Funk, who turned out to try pot for the first time. "I was military, so I couldn't do it (before)."

The buzzing crowd spanned from the entire length of the Burnside Bridge, waiting for free samples and to consume and share weed.

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The crowd celebrates as the clock strikes 12 and marijuana officially became legalized in Oregon. Christina Belasco / OPB

While Wednesday marks the first day that Oregonians who are 21 years old and older can use marijuana recreationally, Oregon lawmakers have yet to create regulations for stores in the state. That means people can't obtain pot legally unless they have a medical marijuana card or it's given away freely.

Recreational stores could open as early as Oct. 1.

Portland's chapter of the National Organization for the Reform of Marijuana Laws — a nonprofit lobbyist group — sponsored the free bridge pot party as a way around the temporary limit on recreational sales. Various medical dispensaries and advocacy groups pitched in to hand out free samples and seedlings for people to grow at home, which is allowed under Oregon's new law.

The crowd turned out to be much larger than anticipated.

"Well, you can see we are stretched from edge-to-edge on the Burnside Bridge. The sidewalks are packed," said Russ Belville, executive director of Portland's NORML.

Belville initially thought the gathering would be a small group of people localized to the west side bridge landing.

The overwhelming crowd made it hard to gift the free pot, as the organizers quickly ran out of marijuana to pass around. Still, some stragglers held on well past midnight to see if more marijuana would circulate.

Advocates and dispensaries in other parts of the state planned to have similar marijuana giveaways later in the day Wednesday.