What are they doing there and for how long will people be inconvenienced?

Yeah, that totally sucked yesterday. I was going to take that route across to May to avoid taking 63rd, then got all the way down there and had to turn around and use 63rd after all. It looked like it was still closed today.

from odot's twitter:

OKC- NW Grand Blvd. bridge closes over SH-74/Lk Hefner Parkway from noon today thru Thursday for bridge work.

I passed through the area on my bicycle yesterday; the crew graciously let me through. It looked like they were repairing the eastmost expansion joint, as the filler material was gone.