What is a fording point, and when should a relief convoy use one?
A fording point is a place where a road crosses a river or stream at grade, with no structure carrying the traffic over the water. The vehicle drives through the water instead of above it. Some fords are paved low-water crossings built for exactly this purpose, with a marked channel and a concrete or gravel bed. Others are informal, just a stretch of riverbed that's shallow and firm enough most of the year that trucks have always used it that way.
Neither kind shows up as risky on a standard road map. They show up as a road. That's the problem when you're routing a convoy off a network that hasn't been checked since before the event.
Fording point vs. bridge crossing: the actual tradeoffs
A bridge gives you a fixed deck height, a known load rating, and (when it's standing) a crossing that doesn't care what the water's doing underneath it. A fording point gives you none of that. Depth and current change with rainfall upstream, sometimes by the hour. A ford that was ankle-deep Tuesday can be axle-deep Thursday if there's been rain two valleys over that never touched your location.
What a ford gives you in return is redundancy. If the bridge on your primary route is down, cracked, or load-restricted below what your trucks weigh loaded, a known ford nearby can be the difference between a convoy that moves today and one that sits for three days waiting on a structural assessment or a bridging unit that isn't coming.
The tradeoff is simple to state and harder to manage in the field: a bridge is slower to fail but takes longer to fix. A ford fails and recovers fast, sometimes within the same day, which means the window to use it safely can close before your convoy is even through the queue to cross.
When a convoy should use one
Use a fording point when the bridge on your route is confirmed out and the ford is a documented alternative for that crossing, logged and driven by someone on your team within the last few hours. A ford nobody's driven since the flood is a guess with wheels.
Check current conditions before committing: depth gauges, local advisories, or a driver who's crossed it in the last few hours all beat yesterday's sitrep. Water that looks the same from the bank can be running twice as fast after an upstream release or a second storm cell.
Send your lightest, highest-clearance vehicle through first if you have the option. Don't stage your whole convoy at the water's edge waiting on it; a line of trucks parked on an approach road is exposed to the next debris surge or bank collapse.
Keep a ford off the route for anything carrying fuel, medical cold chain, or passengers if there's a drivable alternative, even a longer one. The time saved rarely justifies what you lose if a vehicle stalls mid-crossing with rising water behind it.
Knowing which option is still there
The hard part is knowing in real time whether the bridge is gone and whether the ford is passable, instead of routing off whatever the network looked like last month. That gap is where a convoy plan that works turns into one that finds out the hard way at the water's edge.
Route Disruption Mapping compares the latest imagery pass over a crossing to the one before it and flags what changed: a downed span, a washed-out approach, a new debris pile in the channel, with the before/after image pair behind the flag so a coordinator can see exactly what failed and decide whether the alternate is worth the risk.
If you're routing convoys around a network you haven't had eyes on since the last event, that's worth a look before the next one sends you out blind.