S. 637 — Navajo-Gallup Water Supply Project Amendments Act of 2025

1%becomes law moderate confidencepending: Senate reported

Navajo-Gallup Water Supply Project Amendments Act — reported and queued, quiet for 458 days; 5% to reach the floor, 1% to become law.

reaches a floor vote

99%

passes if voted (stage model)

23%

survives downstream

becomes law

The gap: on the floor this would pass — 54% by the member-vote simulation — but the floor is the hard part: 5% to ever get the vote. That gap, not the whip count, is the story.

If it reaches the floor

majority

60 (cloture)

Projected 66 yea of 100 voting; 90% interval 37–95 (quartiles 53–81). Intervals are backtest-verified to cover ~90%.

Filibusterable: the realistic Senate line is 60 votes — P(≥60) = 54% (simple-majority P = 88%).

By floor procedure

No vote is scheduled, so the headline marginalizes over how the Senate would take it up; the branches:

Procedure	Likelihood	Projected yea	Passes
conference	5%	69 [37–97]	90%
passage	95%	65 [36–95]	88%

Receipts

Sponsor: Ben Ray Luján (D). Latest action (2025-03-05): Committee on Indian Affairs. Ordered to be reported without amendment favorably.
Full record: Congress.gov.

Forecast run predict-20260606T193507Z · models member-vote-1.0.0-t117d118-20260606 + passage-1.0.0-t117d118-20260606 · conditional whip forecasts for the Senate run at moderate confidence (why).