HOLDREGE, Neb. (AP) — Nebraska’s largest reservoir could be full by Sunday, but officials aren’t yet sure whether that portends downstream flooding as any overflow is released.

As of Wednesday morning, Lake McConaughy (muh-KAHN’-uh-hay) on the North Platte River was 97.9 percent full, with inflows higher than releases. Upstream in Wyoming, reservoir water was pouring over the spillway at Pathfinder Dam. Upstream of that, the Seminoe Reservoir was 87.1 percent full.

Melting of higher-than-normal snowpacks in the North Platte and South Platte basins is just starting. The rivers merge east of North Platte to form the Platte River.

Civil engineer Cory Steinke told the Central Nebraska Public Power and Irrigation District board Monday that any flooding downstream from North Platte depends on how the snow melts.