Bulk Gravel and Stone Delivery in Lewis and Clark County, MT
Montana Rock Supply brings gravel, stone and aggregate delivery in Lewis and Clark County, MT to Helena, East Helena, Lincoln, Marysville, Canyon Creek and Wolf Creek. Crushed base course sits at the center of most of that work, because it is the material Montana drives, pads and lanes are built on.
Ground here is gravelly alluvium and outwash on the basin floors, with clay-rich fill in places and thin stony soil over rock on the ranges that ring them. That mix decides what goes under your project and what drains it.
Materials Delivered in Lewis and Clark County
Base material in Montana is specified as crushed base course.
The MDT Standard Specifications for Road and Bridge Construction cover it under Section 701.02.4, where grades are named by nominal top size: Grade 5A at 2 inch minus and Grade 6A at 1 1/2 inch minus, with a 3/4 inch minus grade, 7A, developed as pit sources for the larger sizes ran short.
City and county work is more often written against Section 02235, Crushed Base Course, of the Montana Public Works Standard Specifications. County road standards call sizes out as 3 inch minus sub-base and 1 inch minus crushed base or top course.
Montana yards say 3/4 minus for the base you put under a drive, a shop pad or a parking area.
Washed stone and sand cover the wet side of a job. Washed Sand levels and beds flatwork and pavers, and Mason Sand goes into brick and block work and paver joints.
For beds and borders, Yellowstone River Rock is rounded river-washed stone, the usual alternative to bark in a dry climate. 3/8" Natural Pea Gravel suits walkways, play areas and dog runs where rounded stone is wanted.
Choosing the Right Material
Jefferson County shares this county's ground region: gravelly alluvium and outwash on high basin floors, clay-rich basin fill in places, and thin stony soils over rock on the ranges. The same base and drainage reasoning applies there as here.
Cascade County is different ground. Its benchlands carry deep silty and clayey prairie soils, with gravelly terraces along the Missouri, Judith and Musselshell and shallow stony ground on the island ranges.
Clay-heavy ground holds water, so drainage rock matters more there than it does on gravelly outwash.
Teton County runs gravelly glacial till and outwash along the Rocky Mountain Front, grading into deep clay and silty prairie soils, with cobble alluvium on creek bottoms. Till and cobble both drain differently from basin fill, which changes what a base course sits on.
Match the material to the job. Crushed base course under a drive or pad.
Road mix on the surface of a lane. Pit run for deep fill and raising grade before a base goes down.
Washed rock anywhere water has to leave.
Ground Conditions Across Lewis and Clark County
This county spans two ground regions. In the southwest and south-central mountain valleys around Helena, East Helena, Marysville and Canyon Creek, snowmelt off the Great Divide, sudden summer thunderstorms on dry ground and irrigation ditches crossing valley floors all move water.
Gravel basin fill takes water readily. Clay-rich basin fill does not, and water that cannot get through sits where it lands.
That difference decides whether a drainage layer goes in and how a base course is built over it.
In the western intermontane valleys around Lincoln, Lake-bed silt drains slowly and stays soft well into spring, while river gravels beside it drain fast. Snowmelt off the surrounding ranges puts rivers up through May and June.
Spring runoff and bank scour drive erosion work, along with gullying and debris flows off burned mountain slopes. Riprap armors stream banks, culvert outlets, coulees and ditches against that high water.
The working season is short. Base, driveway and paver work runs from late spring into early autumn on the valley floors, and shorter again on high ground.
Hard overnight freezing with a daytime thaw runs through much of the year at these elevations, so frost heave in drives and roads is a normal condition rather than only a spring event.
Delivery Across Lewis and Clark County
Order online and a dump truck tips the load on site in one pile. Quantities are ordered by the ton or by the yard, and each product page has a calculator to size the load.
Pick a delivery date at checkout.
Have the drop area clear and reachable before the truck arrives, with room for the pile and a firm surface under it. Bulk material arrives as one tipped load, so the spot you choose is where it stays.
Delivery covers Helena, East Helena, Lincoln, Marysville, Canyon Creek and Wolf Creek, along with the surrounding parts of the county.
Questions About Gravel and Stone in Lewis and Clark County
What is the difference between topsoil and fill dirt?
Topsoil is screened soil for lawns, grading and bed prep over thin or stony native ground. Fill dirt is bulk fill for backfill and raising grade before a base course goes down.
Fill dirt is not a growing medium, and topsoil is not structural fill. Choose by whether the ground has to grow something or carry something.
What is crushed base course and what is it used for in Lewis and Clark County?
Crushed base course is the standard Montana base material, usually ordered by top size as 3/4 minus. It goes under driveways, shop pads, parking areas and shed bases.
In Montana it is specified under MDT Section 701.02.4 by nominal top size, and city and county work is written against Section 02235 of the Montana Public Works Standard Specifications.
How deep should a gravel driveway base be in Lewis and Clark County?
Depth depends on your ground and what the drive has to carry. Gravelly alluvium on the basin floors and clay-rich fill in places take different amounts of base, and hard overnight freezing with a daytime thaw runs through much of the year here.
Each product page has a calculator to size the load once you know your area.
Order Gravel, Stone and Aggregate in Lewis and Clark County
Montana Rock Supply delivers crushed base course, road mix, pit run, washed rock, crusher fines, sand, topsoil and decorative stone across Lewis and Clark County. Driveways, shop pads, parking areas, drainage runs, paver bedding, raised beds and bank armoring all start with the right material under them.
Order online and have it tipped on site.