Cycling Nicomen Island along the Fraser River (McIntyre Rd/Carter Rd etc.)

Was looking at possible gravel-ish routes in the Fraser Valley this weekend. Following the Fraser along the south side of Nicomen Island looks pretty.

Looks like there's good tracks to follow from the Dewdney Bridge - McIntyre Road, Carter Road etc. However some sections are marked as private on OSM and I can see there are some gates in places.

Anyone know any more?

(In general I am not familiar with the "culture" around access issues/trespass in BC. In my home country, farmers are often tolerant of hikers/bikers on access roads even when they don't technically have the right to be there - as long as they are respectful. I suspect it's a bit more strict here?)