According to the MI DOT website it is open. The website has all major construction related closures at any given time.
We drove 131 through GR earlier this week. I didn't take note of that specific ramp, but the website information should be reliable.
2007 Country Coach Tribute; Cat C9 400; 2012 Ford Edge toad; Roadmaster Blackhawk 2 10,000 lb tow bar; Demco AF1 Braking System; 2007 BMW K1200LT Hannigan Trike Conversion; Member, IEEE, NFPA, PMI, NRC SRO (Ret).