CLEVELAND — Workplace productivity across Ohio reached historic lows today.

Three days after the Cavaliers captured the NBA title, an estimated 1.3 million revelers shut down Cleveland today for a championship parade achingly held elsewhere for the past 52 years.

Fans lined the length of the parade route — from Quicken Loans Arena all the way to E. 6th Street and Lakeside Avenue — by dawn and kept coming, They choked the streets as many as 30 deep, climbed trees and cast-iron fences, and hung out of office windows and parking garages and over highway overpasses. By 11 a.m., with the procession set to begin and the city at a standstill, many simply abandoned their cars on the side of I-77 and finished the pilgrimage by foot.

Anything to catch a glimpse of LeBron James and their conquering heroes.

IN PICTURES: Cavs parade fills downtown Cleveland

Welcome to the Cleveland. City of champions.

“You guys are unbelievable,” James told the crowd at a culminating rally at Mall B. ”I love all of you.”

The Cavs rallied from a 3-1 finals deficit against the Warriors to deliver Cleveland its first title since the Browns won the NFL championship in 1964.

James gave those hometown fans even more reason to celebrate Wednesday by telling reporters he intends to stay in Cleveland, skipping the drama of previous splashy announcements when he decided to go to Miami in 2010 then come back to the Cavaliers four years later.

“I’m just one man. I’m one man with a plan, with a drive, with a determination,” James said.

Guard Kyrie Irving gave props to James’ block on Andre Iguodala that set up his 3-pointer to take the lead for good in Game 7. James raved about Irving but also Kevin Love’s defense in the final moments against NBA MVP Stephen Curry. And Richard Jefferson, who said after winning the title that he planned to retire, got caught up by crowd chants of “one more year” and told them if they wanted him back, he’d return.

“I wouldn’t trade it for the world,” Irving said.

This was the parade Cleveland has waited to throw since 1964, when the beloved Browns owned the NFL. There were lean years — and so many close calls — in between before James, born in nearby Akron, made good on his promise to bring home a championship.

Fans stood on rooftops, portable toilets and hung out of office building windows hoping to get a glimpse of James, who rode in a Rolls Royce convertible with his wife, Savannah, and their three children. Near the start of the route and just feet from his iconic, 10-story banner, James stood and posed with his arms outstretched just as he does on the giant mural — life imitating art, the photo op of a lifetime.

With the parade slowed, J.R. Smith and Irving hopped off their trucks to mix it up with the crowd, giving high fives, taking selfies. Smith also waved to crowds stacked in a nearby parking garage and blew cigar smoke high into the air.

The parade was delayed several times because of the swarm, which blocked the streets near Quicken Loans Arena and temporarily prevented the open-air vehicles that carried the Cavaliers from getting to the staging area.

The crowd was packed so tightly that fans could reach out and high-five their heroes.

Love wore a golden-studded WWE championship belt, one that was out of Cleveland’s reach for so long.

The rally ended with Browns great Jim Brown passing James the Larry O’Brien trophy, a symbolic passing of the torch for Cleveland sports icons.

When the Browns won Cleveland’s last major sports championship, Lyndon Johnson was president.

No major city had endured more pain with its sports franchises. The Browns, Indians, Cavs and Barons — yes, there was an NHL team here for a brief time in the 1970s — went a combined 146 seasons between sips of championship champagne.

When the Browns won their last title, there was no major celebration. After all, championships were routine as the Browns, led by coaching great Paul Brown and a roster of future Hall of Famers, won seven titles from 1946 to 1955.

Cleveland’s close calls since then have gained infamous nicknames: Red Right 88, The Drive, The Fumble, The Shot, The Move and The Decision are a part of the city’s troubled sports lexicon. The Browns lost three AFC titles to Denver from 1986-1989; the Indians were beaten in Game 7 of the 1997 World Series in extra innings; and the Cavs got swept in the 2007 Finals before losing to the Warriors in six games a year ago. Art Modell packed up the beloved Browns in 1995 and moved them to Baltimore.

Cleveland was so desperate for a parade that the previous one held for a sports team came in 1995 after the Indians made it to the World Series for the first time since 1954. They lost to Atlanta.

A parade for second place.

However, James, Irving and their teammates, who survived a coaching change midway through the season and finally fulfilled expectations in the postseason, have taken Cleveland back to the top.

There’s a new nickname — The End.

First Published June 22, 2016, 4:01 p.m.