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TOOOLBOX/Decision Notes/FINVECTOR 20

FINVECTOR · EVIDENCE TIMELINE · NOTE 20

A 2.87-foot reading needs its timestamp

A live USGS Little Falls snapshot is converted into an observation-age gate instead of being shown as an untimed condition claim.

REPRODUCIBLE WORK

Follow the evidence in the order it becomes usable.

01

Capture

Read value with site ID and parameter

2.87 ft at USGS-01646500
02

Attach time zone

Keep source timestamp in EDT

03:50 EDT
03

Compute age

08:00 − 03:50

4 hours 10 minutes
04

Gate display

Show value + age; do not infer safety

Freshness visible, reach condition still unproven

SOURCE SNAPSHOT

Anchor the event to a source and time.

USGS-01646500 instantaneous valuesReported 2.87 feet at 03:50 EDT on September 2, 2026 when reviewed.Official source · accessed 2026-09-02 ↗

INPUT AND EVIDENCE LEDGER

Keep the snapshot attached to its origin.

FieldValueOrigin
Monitoring locationUSGS-01646500, Potomac River near Washington, DCUSGS
Gage height2.87 feetUSGS latest value
Observation time2026-09-02 03:50 EDTUSGS
Decision time2026-09-02 08:00 EDTControlled system time

DECISION READING

What survives the timeline check.

The number remains useful only when it stays attached to the station, parameter, unit, and time. FINVECTOR should degrade or withhold a hydrology layer when the age exceeds its declared threshold, not silently reuse it.

SENSITIVITY

Where the chain can go stale.

  • A gauge can publish multiple parameters at different update times.
  • Station conditions and provisional qualifiers can change interpretation.
  • The fishing reach may not be represented by the station.

BOUNDARIES

Do not extend the timestamp into a promise.

  • Gage height does not establish safe wading or boating.
  • This is a timestamp demonstration, not a trip recommendation.
  • The source value is a dated snapshot and will become stale.

OWNER AUTHORIZATION + VERIFICATION RECORD

One accountable operator and a reproducible check record.

The TOOOLBOX site owner authorized this publication scope and remains the correction contact. The checks below were completed during preparation with AI-assisted implementation; they are an audit record, not a claim of licensed professional review.

Review ID
TB-FINVECTOR-20-20260902
Owner role
TOOOLBOX site owner and developer
Release scope
Owner-authorized · 2026-09-02
Correction channel
Public contact page
  1. Matched the station ID, parameter, value, unit, and timestamp.
  2. Recomputed the age in the source time zone.
  3. Removed any wording that equates gage height with fishing or safety quality.

MORE FINVECTOR DECISION NOTES

Compare another evidence pattern.

The related notes deliberately use different questions, data states, and editorial forms.

23 · Planned stocking and actual stocking are different datasets →24 · A forecast card needs a data-lineage trail →