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Understanding River Flow Data and Off-Road Vehicle Crossings
Cubic feet per second (CFS) is a measurement used to describe the flow rate of water in rivers and streams.
It represents the volume of water passing a specific point in the river each second. Specifically, 1 cubic foot equals
approximately 7.48 gallons of water, so a flow of 100 CFS means 748 gallons of water are flowing past a point every second.
Depth and Speed Correlation
As CFS increases, the depth and speed of the river generally increase. Even if a river looks shallow, high CFS can mean faster-moving water, which can make a crossing more dangerous. The speed of the current and the water’s force can make controlling the vehicle more difficult.
Hydrodynamic Pressure
At higher flow rates, the force of the water increases. This force pushes against the sides and undercarriage of the vehicle, potentially causing it to float or lose traction. Water flowing at 200-500 CFS may already be strong enough to move or destabilize a vehicle, especially if the depth reaches the vehicle's axle height.
Other Considerations
Water Depth: CFS doesn't directly tell you the water depth, but it usually correlates. Always check the depth of the river as well. Terrain: Rocky, uneven riverbeds, combined with strong flow, can make vehicle control harder. Vehicle Design: 4x4 vehicles with good ground clearance and water wading capabilities are more suited for river crossings.
So what's the magic number?
It's difficult to specify a safe CFS value for river crossings because many variables come into play. Every vehicle has different capabilities, such as clearance, tire size, and weight, which affect how it handles water flow. Additionally, driver skill levels vary, and the river's depth, speed, and the presence of obstacles like rocks or hidden holes can drastically change the situation. Even a seemingly low CFS might be dangerous in one spot but safe in another. These factors make each crossing unique, so there's no universal "safe" CFS for everyone.
Winter Effects on Data
During the winter season, ice can form around water gauges, which can significantly impact the accuracy of river flow data. Ice buildup may obstruct the gauge or alter the way water flows past it, leading to potentially incorrect measurements.
If you're not sure which GPX to use, choose "Minified GPX"
Elevation Profile
Description
One of many routes to access the East Fork Carson River Hot Springs from the Nevada side, off of US395, by the China Springs entrance. The route takes you down into Leviathan Canyon and parallels the river to the springs. This place can get crowded, so if you want some peace and quite, go on a weekday! You'll drive through some tight spots, so be prepared for that. Many websites say this trail is a lot harder than it really is. When you get to the "Creek Crossing" waypoint, make an immediate right turn into the water and just drive through the trees. It looks like you wouldn't want to go through it, but it's the correct way! Tons of great camping spots along this route.
You will need a bit of clearance, but no lockers or huge tires necessary. If you're going to cross the river at the end, gauge the water level first. Different times of year require different levels of clearance.
