Where I live the Forest Service uses light blue diamond trail markers. They are sort of what I would call a line of sight marker, meaning that if you stand next to one of these markers and you look around you should see the next marker. On a long straight away they might be 50 yards apart but in some places they can be as close as 10 or 15 feet. They are also night time reflective.
But sometimes you see a red marker or a dark blue marker which are definitely not used a lot, you may see one every mile or so although they don't seem to mark mileage. So I always wonder what these colors mean or do they just not mean anything and they ran out of light blue.
The first pic was the light blue often used. This is the red one
Here where I live, different colors are different uses.
Orange are the ones I follow, which are motorized and mixed-use trails.
Blue ones are non-motorized only.
I'm not aware of any others, but it wouldn't surprise me if there were others.
Even the signs for parking lots are color-coded orange or blue based on their use.
All that is also mirrored on the FS MVUM's, although in the summer you're more likely to see graphical representations of what's allowed (Motorcycle, ATV, 4x4, Horse, Bicycle, Hiker) on the fiberglass markers (along with trail number and difficulty). Winter trail markers are usually higher up in the trees.
Is it marked on any maps as a multi use trail? For example a hiking/equestrian trail may have green markers every 50 yards to indicate hiking trail. Then every 1000 yards maybe a red marker to indicate it is still shared with horse riders.
Or, is this a long distance trail? The parcels of land containing a long distance trail are usually not managed by just one agency. You may pass through federal, state, county, or even local parkland on a single LDT without realizing it. Furthermore, each level of govt. above may include different agency management (nps, blm, usfws, usfs, state div. parks, state div. forestry, etc etc)
Thanks!! I think this may be it. The uses for the trails I use are hiking/mountain biking/cross country skiing snow shoeing. And the one red diamond might be the marker that says you're going for local land to forest service land, even though the trail is called a forest service trail (which it is). The forest services land starts at the end of the local governments right of way which is around a 1/4 mile.