Upper North Platte water level
If you're interested in the Northgate-Six Mile Gap-Treasure Island reach of the North Platte, what's likely occurring is that the waterhog ranchers in North Park, CO are diverting most of the flow from the tributaries to flood hayfields. (The Big Laramie River is actually higher right now than the North Platte at Northgate: sad.) Once the fields fill up and there are return flows, the water at Northgate might come up a bit.
A string of warm days (& warm nights) can amp the flows, and rain on top of a thawing snowpack can set up a nice bump (e.g. 1400-2000 cfs) which is perfect for the whitewater section. But you have to keep an eye on the USGS gage and be ready to go at short notice. In a year like this, with low snowpacks, the peak might last only a few days.