How we grade fishing conditions

Summary

Every morning and afternoon block gets a verdict: Good, Fair, or Poor. The verdict measures whether you can get out of the pass and fish effectively.

It is a conditions verdict, not a bite forecast. We grade the factors that determine whether the trip runs and the water is workable, and we deliberately do not score bite-prediction theories. The worst factor sets the verdict, the same way the EPA Air Quality Index reports the worst pollutant rather than an average. Missing data is excluded, never guessed.

Breakpoints

Composite rule

Worst factor wins, named as the limiting factor. Never an average, because one bad component cancels a trip regardless of the other five.

Pressure trend and water temperature appear as context chips on the report pages. They never move the verdict, because the evidence behind bite-prediction rules is too mixed to grade on. Every score in this genre that claims otherwise is a black box. Ours publishes its rules on this page.

The river bands

We classify the Brazos against its own day-of-year history at the USGS gauge, not an invented number. Below the 25th percentile reads low and clear; through the 75th is normal; to the 90th is elevated, with stained water near the river mouth; above the 90th is high, and a mud line pushes offshore.

USGS streamflow is provisional and revised later, so we mark it provisional and treat it as a live estimate.

The best window

We compute the day’s solunar majors and minors from lunar position, weight the low-light hours around sunrise and sunset, then favor the windows that sit over a rising or falling tide. Moving water in low light is the oldest read in the book; we just do the math.

The tide anomaly

The hi/lo table is an astronomical prediction; wind moves the real water level off it. We read the live water-level gauge at Freeport Harbor against that same gauge’s own prediction, so the gap we show is true wind setup or setdown, not a difference between two stations.

A positive gap means onshore wind is stacking water in; a negative gap means offshore wind is draining the bays.

Water quality and catches

Beach water quality is the State of Texas’ own Enterococcus advisory for each Surfside and Quintana sampling site, shown verbatim, not a level we compute.

Recent catches are research-grade iNaturalist observations from the last 30 days within 75 km of Freeport, a sample of what people log, not a count of the catch. When there are none, we say so rather than show stale records.

The archive

We do not throw the daily verdict away. Every morning and afternoon block, for both the Freeport and Galveston areas, is graded and kept. That archive runs from June 2021 through December 2025, which is why we can tell you how often July mornings actually fished, not just how they feel.

Coverage is not even across every year. 2021 is a partial year: the archive starts in June, so its rates cover June through December only and should never be read as a full year. Galveston coverage is also thinner in some years, so we flag its annual figures as directional rather than exact, and we do not publish a head-to-head Freeport-versus-Galveston number until the two cover matching periods.

The numbers are frozen, not live. We run the archive queries once, stamp the result with the grading version (currently va-1.0), and the pages read from that frozen copy. So a rate on this site does not quietly shift between visits, and anyone can check our work. The full record is on our Freeport fishing data page, free and downloadable.

A worked example

Here is how one real morning got graded. Take a July morning at Freeport with a light 12 mph wind (Good), a 2 ft chop (Fair), no rain (Good), the river running at its normal summer flow (Good), and no marine warnings posted (Good). Five of the six drivers say Good. The seas say Fair.

The verdict is Fair, not Good, and not some average of the six. Worst factor wins: the 2 ft chop is the limiting factor, so the morning is graded Fair and the chop is named as the reason. It still counts as fishable, because fishable means Good or Fair. Swap that chop for a 5 ft sea and the same morning would grade Poor, no matter how calm everything else was.

Data sources

Limitations

• The verdict grades Gulf trips out of the pass. Protected bay and jetty water often fishes when the open Gulf does not, so the rates understate total fishing options, more so for Galveston with its larger bay system.
• Historical rows (2021 to 2025) carry no marine-alert record. Observed wind, seas, and rain stand in for it.
• Wind direction is not graded directly. Its effect is priced in through measured seas.
• Fog and visibility are not graded.
• Historical tides are predictions. Gulf wind-driven water levels can deviate.
• Blocks missing wind or seas data carry no verdict and are excluded from every published rate. Coverage by port and year is disclosed wherever a rate is cited, and the full five-year record is published on our Freeport fishing data page .

How to cite this page

Brazosport Fishing Guide conditions methodology, brazosportfishingguide.com/methodology/. For data questions, contact info@brazosportfishingguide.com.