There are several gauging stations in Yosemite Valley placed there to measure the flow of the rivers

There are several gauging stations in Yosemite Valley placed there to measure the flow of the rivers. The normal river height of the flow at the Pohono bridge Gauge is 3.5 feet. The river is considered to be at flood stage when it is 6.5 feet above this level, or 10 feet. During a record flood, the water level reached 23.45 feet. Happy Isles Gauging station is at an elevation of 4017 feet located where the Little Merced River enters the Valley.

During flood conditions, would you expect the river height recorded at happy isles to be greater, equal to, or less than the height recorded at Pohono bridge? Why?