Grade stakes are wooden stakes driven into the ground on a construction site that tell equipment operators and crew members how much earth to move, in which direction, and where the finished surface should end up. Each stake is marked with shorthand notations using letters, numbers, and symbols that communicate cut and fill depths, station locations, and offset distances. Once you understand the system, reading them is straightforward.
What a Grade Stake Looks Like
A grade stake is typically a flat wooden stake (called a lath or hub) driven into the ground near the work area. The surveyor writes information on the flat face of the stake using lumber crayon or marker. You’ll usually see two sides used: one facing the direction of travel or the centerline, and the other providing supplemental details. The markings are compact because space is limited, which is why abbreviations dominate.
Most grade stakes carry three types of information: where you are on the project (stationing), how far the stake sits from the actual work point (offset), and how much dirt needs to be cut away or filled in to reach the designed elevation (cut or fill).
Cut and Fill: The Core Information
The most critical markings on any grade stake are the cut and fill values. These tell you the vertical difference between the existing ground and the planned finished surface at that point.
- C (Cut) means you need to remove material. The ground is too high, so earth must be excavated down. A marking of C 4.10 means cut 4.10 feet, removing that depth of soil to reach the design elevation.
- F (Fill) means you need to add material. The ground is too low, so earth must be brought in and compacted. A marking of F 6.25 means fill 6.25 feet of material at that location.
- FG (Finish Grade) indicates the stake is set at the planned final surface elevation. No cut or fill is needed at that point, or the value refers to the finished grade rather than a subgrade layer.
The number following C or F is always in feet (and tenths of a foot, not inches). Construction surveying uses decimal feet rather than feet and inches, so 4.10 means four feet and one-tenth of a foot, which is about four feet and one and a quarter inches. This is a common point of confusion for anyone used to reading a tape measure in fractions.
When you see both a cut and fill value on the same stake, it usually means the work transitions from cut to fill across that section, such as when grading a ditch or swale where one side gets excavated while the other gets built up.
Stationing: Your Location Along the Project
Stationing tells you where you are along the length of a project. Surveyors measure horizontal distance along the centerline (or baseline) of the work and assign station numbers at regular intervals. One station equals 100 feet.
The format uses a plus sign as a separator. Station 1+00 is 100 feet from the starting point. Station 7+00 is 700 feet from the start. Station 10+00 is 1,000 feet out. If you need to figure out the distance between two stations, drop the plus signs and subtract. The distance between station 7+00 and station 10+00 is simply 1,000 minus 700, or 300 feet.
Stations don’t always land on even hundreds. A stake marked 4+62 sits 462 feet from the project’s starting point. You’ll see these fractional stations wherever something specific needs to happen between the even 100-foot intervals, like a drainage structure, utility crossing, or change in slope.
Offset Distance
Grade stakes are rarely placed at the exact spot where work happens, because equipment would destroy them immediately. Instead, surveyors drive the stake a known distance away from the actual work point. This distance is the offset.
A marking of O/S 10′ means the stake is offset 10 feet from where the grade change applies. An arrow or notation on the stake indicates which direction the work point is relative to the stake. When you’re operating equipment, you measure from the stake toward the work point by the offset distance to find the exact location where the cut or fill depth applies.
Offsets are typically consistent within a project (often 5, 10, or 25 feet), so once you know the standard offset being used, you can move efficiently from stake to stake without rechecking each one.
Slope Ratios
Some stakes, particularly slope stakes placed at the edges of embankments or excavations, include slope ratio markings. These describe how steep the side of a cut or fill should be.
A slope ratio is written as two numbers separated by a colon. The notation 2:1 means the slope runs 2 feet horizontally for every 1 foot of vertical change. A 3:1 slope is gentler, running 3 feet horizontally per 1 foot of rise or drop. The first number is always horizontal distance, and the second is vertical.
In practical terms, a 2:1 slope on a fill that’s 6 feet high would extend 12 feet outward from the toe of the slope to the top. Equipment operators use these ratios to shape embankment sides to the correct angle, and inspectors check them to ensure stability and drainage requirements are met.
Putting It All Together
A fully marked grade stake might read something like this on its face:
STA 4+50
O/S 10′ RT
C 3.25
2:1
That tells you the stake is at station 4+50 (450 feet from the project origin), offset 10 feet to the right of the centerline. The ground needs to be cut 3.25 feet at the work point, and the side slope should be graded at a 2:1 ratio.
On a real job site, you’ll also see colored flagging tied to stakes. Different colors often designate different types of work (grading, utilities, curb and gutter), though the color code varies by project. The survey crew or project engineer typically explains the color system at the start of the job.
Tips for Reading Stakes in the Field
Surveyor handwriting on a muddy lath isn’t always crisp, so distinguishing a C from an F matters. If you’re unsure, check the context: if you’re standing in a low area that obviously needs to come up, the marking is almost certainly fill. If the stake is on a hilltop, it’s likely cut.
Always confirm which side of the stake carries which information. Some surveyors write the station and offset on the back (the side facing away from the work) and the cut or fill on the front (facing the work point). Others follow different conventions. Ask the survey crew at the start of the project how they’re marking their stakes.
When a stake has been knocked over, leaned, or looks like it may have been repositioned, flag it and get it reset by the survey crew before working to it. A stake that’s moved even a few inches can throw off an elevation enough to cause problems down the line, especially on projects with tight tolerances like building pads or roadway subgrade.