Retaining Wall Gravel - Material Guide
Picking the right gravel for a retaining wall gravel project? This guide covers the materials that fit best, how much you need, and what it costs delivered.
Picking the right material for retaining wall gravel starts with one question: is this surface going to carry traffic or carry water? Load-bearing jobs want fines that compact. Drainage jobs want clean stone with open voids. Below are the specs, install steps, depths, and regional prices we run on real retaining wall gravel jobs every week.
Best materials for retaining wall gravel
What retaining wall gravel needs in a material
- Size and shape: mix of riprap, 3/4 inch backfill, fill dirt.
- Drainage: wall backfill carries water away from face.
- Compaction: lifts compacted in 6 inch passes behind wall.
The three specs above drive every other choice on a retaining wall gravel job. Order the wrong size and the surface fails fast. Pick a material that drains the wrong way and you fight standing water or washouts. Get these right and the install steps below take care of the rest.
How to install retaining wall gravel
-
1
Dig the footing
Excavate 12 inches below grade for a compacted base trench.
-
2
Compact the base
Place 6 inches of class-5 or crusher-run, compact in two lifts.
-
3
Set wall stone
Stack block or stone, back-batter 1 inch per foot of wall height.
-
4
Backfill with drain rock
Place clean stone behind the wall with a drain pipe at the base.
How much retaining wall gravel material do you need
| Project size | 3 inch depth | 4 inch depth |
|---|---|---|
| 100 sq ft | 0.9 cu yd / 1.3 tons | 1.2 cu yd / 1.7 tons |
| 300 sq ft | 2.8 cu yd / 3.9 tons | 3.7 cu yd / 5.2 tons |
| 600 sq ft | 5.6 cu yd / 7.8 tons | 7.4 cu yd / 10.4 tons |
Quantities above assume crushed stone at roughly 1.4 tons per cubic yard. Pea gravel and river rock run a bit lighter, decomposed granite a bit denser. Add 10 percent waste for irregular shapes and edge losses.
What retaining wall gravel costs in 2026
| Region | Delivered per ton | Typical 300 sq ft project |
|---|---|---|
| Northeast | $46 to $79 | $161 to $277 |
| Midwest | $35 to $62 | $123 to $217 |
| South | $33 to $59 | $116 to $207 |
| West | $53 to $97 | $186 to $340 |
These ranges hold for full-truck delivered prices in 2026. Diesel surcharges, distance from the quarry, and load size all shift the number. Quotes get sharper once we know your ZIP and the tonnage you need.
Retaining Wall Gravel mistakes to avoid
- Backfilling with native clay, which holds water and pushes the wall.
- No drain pipe at the base, so hydrostatic pressure builds up.
- Skipping the compacted base, so the first course settles uneven.
- Building over 4 feet without an engineer, which fails code in most areas.