Seahawks running back Marshawn Lynch announced his intentions to retire during Super Bowl 50 with a single Tweet. On Thursday, that transaction became official, with the Seahawks placing Lynch on the reserve/retired list.

Lynch came to Seattle in a 2010 trade that turned out to be a bargain for the Seahawks, who sent fourth- and fifth-round picks to Buffalo for a player who would go on to earn Pro Bowl honors four times with Seahawks and All-Pro honors twice (first team in 2012, second team in 2014).

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In six seasons with Seattle, he rushed for 6,347 yards and 57 touchdowns. Lynch's meaning to the Seahawks went far beyond stats, however. Lynch didn't just bring the ability to run for big yardage and touchdowns to Seattle, he helped set a physical tone for a team that would make the playoffs for five straight seasons from 2012 to 2016, winning one Super Bowl and appearing in another.

"He's not carrying the football, he's carrying his team," offensive line coach/assistant head coach Tom Cable said last year. "That's who he is. That's what he does."

Seahawks coach Pete Carroll said of Lynch in 2012: "I don't know if anything is more symbolic than what we've done with Marshawn and him playing the way he's played and him being the guy he is. I think he really is the key element to putting this thing together from the attitude perspective at least."

With Lynch retired, the Seahawks will enter a new era in 2016, but do so knowing they have a talented young back in Thomas Rawls, who rushed for 830 yards as a rookie, averaging a league-best 5.6 yards per carry. The Seahawks also re-signed Christine Michael this offseason, then added three running backs in last week's NFL Draft, selecting C.J. Prosise in the third round, Alex Collins in the fifth and Zac Brooks in the seventh.