Lithology Log

Q: Where can I find lithology logs for wells drilled in Northern Idaho?

Lithology logs are part of the well log records filed with IDWR and are publicly searchable through their online well log database. You can search by location or legal description to find logs from wells drilled near your property.

Q: Does Trident Drilling provide a lithology log after completing my well?

Yes. Every well completed by Trident Drilling includes a well log with lithology documentation filed with IDWR as required by Idaho law. A copy can be provided to the property owner upon request.

A lithology log (also called a formation log or driller’s log) documents the specific types of geological material the drill bit passes through at each depth interval during a well drilling project. Entries typically include material types (clay, gravel, sand, basalt, granite, fractured rock), color, relative hardness, and the depth at which the driller encountered water-bearing zones. In Northern Idaho, lithology logs are especially valuable because subsurface conditions vary significantly — from sand and gravel over the Spokane Valley–Rathdrum Prairie Aquifer to dense basalt and fractured rock in higher elevations and other parts of the service area.

Where can I find lithology logs for wells drilled in Northern Idaho?

How accurate are lithology logs for predicting my new well's depth and cost?

Lithology logs from neighboring wells provide the best available estimate of what a driller will encounter on your site, but geology can vary significantly even within short distances — particularly in areas with basalt formations or variable sediment depths. Trident Drilling uses lithology logs as one of several data sources when preparing a depth estimate, but no depth can be guaranteed before drilling.

Does Trident Drilling provide a lithology log after completing my well?

Why Lithology Log Matters

Lithology logs from completed nearby wells are one of the best available tools for estimating the likely depth, difficulty, and cost of a new well on a neighboring property. They also document where water was encountered and how productive the water-bearing zone was — directly informing GPM expectations. Lithology logs are part of the official well log filed with IDWR and are therefore publicly accessible.

How Trident Drilling Company Uses It

Trident Drilling reviews available IDWR lithology logs from wells drilled in the vicinity of any new project site. This research informs the company's depth estimates, drilling method selection, and worst-case scenario cost bids — giving clients more accurate expectations before drilling begins.

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Frequently Asked Questions

Where can I find lithology logs for wells drilled in Northern Idaho?

How accurate are lithology logs for predicting my new well's depth and cost?

Does Trident Drilling provide a lithology log after completing my well?

Why Lithology Log Matters

How Trident Drilling Company Uses It

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