The River Doesn't Lie — BETA Field Notes

There's a streamflow badge on the Index Town Wall and Miller River pages. A number, an arrow, a trend. Here's where that data comes from, why I almost didn't build it, and what it's actually telling you.

A gauge that looked alive but wasn't

When I was building BETA, I knew I wanted river data for the Skykomish crags. The Skykomish is the vein running through the whole US-2 corridor — when it's running high and angry, the approaches are a mess regardless of what the weather's doing right now.

I found a USGS gauge closer to Miller River that looked perfect on the map. Active status, right location, exactly what I needed. I wired it up, ran the pipeline, and got nothing back. Crickets. Turns out that gauge has been inactive for years — just sitting there on the USGS map looking like it's doing something.

That's the kind of thing that makes you want to flip a table. But okay — fell back to the Gold Bar gauge, 10 miles downstream. Close enough for what we need.

That gauge is 12134500 — Skykomish River near Gold Bar — and it's what you're looking at on the crag page.

What CFS actually means

Cubic feet per second. How much water is moving past that point in the river every second.

For the Skykomish and these crags, here's a rough read:

Under 2,000 CFS River is low. Approaches are solid.

2,000–5,000 CFS Normal wet PNW winter range. Watch the trend.

5,000–8,000 CFS Running high. Miller River approach conditions get iffy.

8,000+ CFS It's been raining hard. Which probably tells you everything about the rock already.

The arrow matters more than the number

Rising, falling, or steady. That trend is often more useful than the raw CFS.

A falling river at 6,000 CFS is a better sign than a rising river at 3,000. Rising means conditions are deteriorating right now. Falling means the storm is draining out and things are moving in the right direction.

When you're planning a trip for later in the week, watch which way the arrow is pointing.

Why only some crags have it

Streamflow shows up on Index and Miller River because those crags are directly tied to what the Skykomish is doing. The other ten crags don't have it because it wouldn't tell you anything useful — Vantage is in the Columbia Gorge desert, Smith Rock sits above a canyon, Mt. Erie is on an island.

I only surface data that's actually relevant to your decision. Everything else is noise.