"congestion of" is correct and usable in written English.
It is used to refer to a large number of things in a limited space, such as "a congestion of cars on the freeway."
No congestion of big teams.
The screeching congestion of Broadway suddenly seemed to depress Adams.
But the congestion of Britain's airports is real and tangible.
She once described her canvases as "a general congestion of events".
A taxi, slowed by the congestion of 52nd Street, was hailed by my frantic daughter.
Another characteristic symptom is congestion of the conjunctival blood vessels around the corneas of the eyes.
The official verdict: "congestion of the brain" brought on by alcohol abuse and exposure.
Urban landscapes choked by electrical wires and labyrinthine roads evoked the chaotic congestion of Katmandu.
"Get the ball out wide," barks Campbell as a congestion of bodies builds in the centre of the section.
No longer is there the quiet regular stream of bus horses, etc. but the congestion of automobiles, taxis, etc.
The piano part is an unrelenting congestion of difficulty, much of it seeming to celebrate difficulty itself.
