Allowed slump for structural concrete, state by state
Slump limits for structural concrete differ between state DOTs. Each row shows the state's limit and the page of the specification it comes from.
37 states · each value quoted from the state's Standard Specifications, with the page linked · how these answers are produced
| State | Requirement | Source |
|---|---|---|
| Alabama | For structural concrete on Alabama highway projects, the slump shall not be less than 4 inches (100 mm) during placement. | Alabama DOT Standard Specifications, pp. 341–342Alabama DOT Standard Specifications, p. 342 |
| Alaska | For structural concrete on Alaska highway projects, slump must meet Table 501-5 requirements: 4" max without water-reducing admixture, 6" max with Type A/D/E admixture, 9" max with Type F/G admixture, or 6"–9" (wet-shaft) or 7"–9"… | Alaska DOT Standard Specifications, pp. 180–181Alaska DOT Standard Specifications, pp. 179–180 |
| Arkansas | The maximum allowable slump for structural concrete on Arkansas highway projects is 4 inches (100 mm). | Arkansas DOT Standard Specifications, pp. 538–539 |
| California | "Slump flow (min, in) ASTM C1611 20" "The minimum allowable slump flow is 20 inches. The slump flow must not vary by more than 3 inches from the mix design slump flow." | California DOT Standard Specifications, pp. 1300–1301California DOT Standard Specifications, pp. 1301–1302 |
| Colorado | For structural concrete on Colorado highway projects, the maximum slump is 9.0 inches (except for Self Consolidating Concrete, which has separate requirements). Slump must also meet the approved mix design ±2.0 inches. | Colorado DOT Standard Specifications, pp. 565–566Colorado DOT Standard Specifications, pp. 610–611 |
| Delaware | "Use only Type F or Type G admixtures for slumps greater than 4 - inches. The maximum allowable slump is 8 - inches." "Slump may be increased up to 8 - inches if Type F admixture is used." | Delaware DOT Standard Specifications, pp. 671–672 |
| Florida | For structural concrete on Florida highway projects, target slump values are specified in Table 346-3 with tolerances of ±1.5 inches for conventional concrete (e.g., Class II, III, IV, V, VI, VII). | Florida DOT Standard Specifications, pp. 361–362Florida DOT Standard Specifications, pp. 360–361 |
| Georgia | "Maximum design slump shall be 1.5 in. (40 mm)." "Slump shall not exceed 2 in (50 mm) as determined by GDT 2 7." | Georgia DOT Standard Specifications, pp. 369–370Georgia DOT Standard Specifications, pp. 370–371 |
| Illinois | "Edge slump of the concrete pavement, exclusive of edge rounding, may vary up to 1/2 in. | Illinois DOT Standard Specifications, pp. 267–268 |
| Indiana | For structural concrete on Indiana highway projects, slump shall be no less than 1 in. or more than 3 in. when no admixture is used or when Type B or C admixtures are used. | Indiana DOT Standard Specifications, pp. 748–749 |
| Iowa | For structural concrete on Iowa highway projects, use a slump between 1 and 4 inches as a target range, allowing a maximum of 5 inches as a tolerance. | Iowa DOT Standard Specifications, pp. 427–428 |
| Kansas | "(1) Maximum design slump for slip form On Grade Concrete is 2 ½ inches. Do not designate a slump in excess of 5 inches for all other On Grade Concrete" | Kansas DOT Standard Specifications, Division 400 — Concrete, p. 21 |
| Kentucky | For structural concrete on Kentucky highway projects, the standard slump range is 2–5 inches for Class A and AA concrete (most common for structural work). The Engineer may allow slumps outside this range if the concrete remains workable. | Kentucky DOT Standard Specifications, pp. 302–303Kentucky DOT Standard Specifications, pp. 285–287 |
| Louisiana | For structural concrete on Louisiana highway projects, the slump range is 2–7 inches for vibrated concrete (Table 901.1-1,). For slipform paving, it is 2–4 inches (). | Louisiana DOT Standard Specifications, pp. 914–916 |
| Massachusetts | " Corrective action for non -conforming results shall include reworking the edge, adjusting slip form paving molds to compensate for edge slump, or recalibrating the mixture. | Massachusetts DOT Standard Specifications, pp. 269–270Massachusetts DOT Standard Specifications, pp. 546–547 |
| Michigan | "0- to 3-inch slump for mixtures for pavements." "3- to 5 -inch slump witho ut admixtures or with Type A or D admixture." "Slump (max.) (inch) See Table 1004- 1, notes ( c) through ( n )" | Michigan DOT Standard Specifications, pp. 1074–1075Michigan DOT Standard Specifications, pp. 1058–1059 |
| Minnesota | For structural concrete on Minnesota highway projects, slump ranges vary by mix grade (e.g., 3S12: 1/2–1", 3S52: 2–5", 3Y42: 2–4") as defined in Table 2461.2-5/6/7. | Minnesota DOT Standard Specifications, pp. 537–538Minnesota DOT Standard Specifications, pp. 506–507 |
| Mississippi | "For each additional pound of fibers per cubic yard added in excess of the requirement stated above, an additional inch of slump will be allowed up to a maximum permitted slump of eight (8) inches." "For Class DS, the slump range shall be… | Mississippi DOT Standard Specifications, pp. 957–958Mississippi DOT Standard Specifications, p. 960 |
| Missouri | "Slump and Maximum Water/Cementitious Materials Ratio Class of Concrete Max. Slump, In. Max. Pounds of Mixing Water Per Pound of Cementitious Materials Air-Entrained Non-Air-Entrained A-1 3 1/2 0.46 0.51 B 4 0.51 0.55" | Missouri DOT Standard Specifications, pp. 229–230 |
| Montana | "Maximum Target Value for Slump, inches 2" "All concrete used for the drilled shaft must maintain a minimum of a 6- inch slump until 2 hours after the estimated completion." | Montana DOT Standard Specifications, pp. 264–265Montana DOT Standard Specifications, pp. 268–269 |
| Nebraska | The maximum allowable slump for structural concrete on Nebraska highway projects is 7 inches, with no more than 2 inches of slump difference between any loads of concrete placed. | Nebraska DOT Standard Specifications, pp. 599–600 |
| New Hampshire | Slump for structural concrete on New Hampshire highway projects must be kept within 1–3" for footings and mass concrete, 2–4" for columns/pedestals/walls ≤18" thick, 2–3" for decks/sidewalks/walls >18" thick, 6–8" for tremie concrete, and… | New Hampshire DOT Standard Specifications, p. 199New Hampshire DOT Standard Specifications, pp. 312–315 |
| New Jersey | For structural concrete on New Jersey highway projects, slump requirements vary by item: Class A (e.g., decks, sidewalks, culverts) requires 3 ± 1 inches; Class B (e.g., footings, abutments, retaining walls) requires 3 ± 1 inches; drilled… | New Jersey DOT Standard Specifications, pp. 477–478New Jersey DOT Standard Specifications, pp. 475–477 |
| New Mexico | For structural concrete on New Mexico highway projects, the allowable slump range is 3.5 inches ± 1.0 inch for Class AA, Class HPD, and Class A concrete (per). | New Mexico DOT Standard Specifications, pp. 346–347 |
| North Dakota | For structural concrete on North Dakota highway projects, the allowed slump range is 1.0 to 4.0 inches. | North Dakota DOT Standard Specifications, pp. 422–424 |
| Ohio | For structural concrete on Ohio highway projects, the nominal slump range is 1 to 4 inches (25 to 100 mm), with a maximum slump of 5 inches (125 mm). | Ohio DOT Standard Specifications, pp. 289–290 |
| Oklahoma | For structural concrete on Oklahoma highway projects, slump is not explicitly limited in general specs, but for Class AA concrete in drilled shafts (516.02.B), slump must be 6 in to 8 in [150 mm to 200 mm] at placement start and at least 4… | Oklahoma DOT Standard Specifications, pp. 630–631Oklahoma DOT Standard Specifications, pp. 478–479 |
| Pennsylvania | For structural concrete on Pennsylvania highway projects, the slump upper limit must not exceed 8 inches for traditional non-self-consolidating mixtures with superplasticizers. | Pennsylvania DOT Standard Specifications, p. 1305 |
| Rhode Island | For structural concrete on Rhode Island highway projects, the allowed slump range is 2–4 inches (measured at discharge) for all classes except where admixtures permit higher slump (up to 6 in. with Type A water reducer or 9 in. | Rhode Island DOT Standard Specifications, pp. 284–285 |
| South Carolina | "Batches of Class 2500 concrete with slumps greater than 4 in. after the allowable addition of cement will not be accepted for Department use." "Before discharge into forms, the Department’s representative will perform entrained air… | South Carolina DOT Standard Specifications, pp. 619–620South Carolina DOT Standard Specifications, pp. 634–635 |
| South Dakota | For structural concrete on South Dakota highway projects, slump at placement must be 6–8 inches for free-fall/tremie methods or 7–9 inches for tremie-pumped concrete, with a minimum of 4 inches for 4 hours post-batching. | South Dakota DOT Standard Specifications, pp. 342–343 |
| Tennessee | For structural concrete on Tennessee highway projects, slump shall be 0 to 3 inches for slip-formed concrete (e.g., parapets, median barriers). | Tennessee DOT Standard Specifications, pp. 633–634Tennessee DOT Standard Specifications, pp. 510–512 |
| Utah | For structural concrete on Utah highway projects, do not exceed a 9-inch slump. Slump tolerance varies: ±1.5 inches for ≤3-inch target slump, ±2.5 inches for >3-inch target slump. Class AA(LSF) and AA(ES) mixes suspend slump testing. | Utah DOT Standard Specifications, 2026 Standard Specifications, pp. 884–886Utah DOT Standard Specifications, 2026 Standard Specifications, pp. 887–889 |
| Vermont | "The mix shall not exhibit segregation at the slump/spread used at placement. If the Engineer suspects there is segregation, the Engineer will require a slump/spread test be performed by the Contractor to visually observe the… | Vermont DOT Standard Specifications, pp. 683–684Vermont DOT Standard Specifications, pp. 557–558 |
| Washington | For Washington highway projects, structural concrete slump limits are: 3.5" max for vibrated bridge decks/approach slabs/superstructures, 4.5" max for other vibrated concrete, 7" max for non-vibrated concrete, 9" max for shafts with Class… | Washington DOT Standard Specifications, pp. 366–367Washington DOT Standard Specifications, pp. 473–474 |
| Wisconsin | "Use a 1-inch to 4-inch slump for concrete used in structures or placed in forms, except as follows: - Do not exceed a slump of 2 inches for grade E concrete. - Increase slump as specified in 502.3.5.3 for concrete placed underwater. - The… | WisDOT Std Spec 501.3.6.4 |
| Wyoming | For structural concrete on Wyoming highway projects, the maximum allowed slump is 6 in [150 mm] (Table 513.4.4-1, Class A/B/S). Slump >4 in [100 mm] requires a water-reducing admixture. | Wyoming DOT Standard Specifications, pp. 487–488 |
State DOT specifications apply to that DOT's own contracts; private and municipal work follows the project spec and local code. Specs are revised — confirm the edition named in the source before relying on a value.