UTAH · SALT LAKE COUNTY
Wind Loads Between Two Ranges: Salt Lake City in the Wasatch Front Valley
Pinned between the Wasatch and Oquirrh mountains at roughly 4,200 ft, Salt Lake City lives with canyon-channeled and downslope windstorms that the valley floor never sees evenly. Design speed varies by site.
CANYON WINDS · DOWNSLOPE EVENTS · LAKE EFFECT
What Drives Wind at the Base of the Wasatch
The valley floor is the calm baseline. The hazard concentrates where terrain reshapes the flow — canyon mouths, the east bench, and exposed ground near the Great Salt Lake.
Canyon Channeling
Big Cottonwood, Little Cottonwood, Parley's and Emigration canyons accelerate flow — expect a topographic factor Kzt above 1.0 near their mouths.
Kzt > 1.0 NEAR CRESTSDownslope Windstorms
Cold air draining off the Wasatch crest can erupt into powerful winter downslope events along the Front — the valley's signature high-wind threat.
WINTER PEAKEast Bench Elevation
Foothill bench projects climbing toward the range face more open exposure and stronger speeds than sheltered downtown blocks below.
SPEED RISES WITH GRADEGreat Salt Lake Fetch
Open ground and the lake to the northwest steer western-valley sites toward Exposure C, away from the urban Exposure B that covers most of the city.
EXPOSURE B → CReading the terrain: Downtown and established neighborhoods read as Exposure B. Western flats near the lake, open foothill ground, and exposed benches can push to Exposure C. Per ASCE 7-22 the valley floor is Kzt = 1.0, while sites near a canyon mouth or escarpment rise above 1.0 and fall back to 1.0 away from the feature. Elevation near 4,200 ft is absorbed into Ke.
PERMIT-READY CHECKLIST
What a Salt Lake County Submittal Has to Show
Every sealed wind package for a city project carries the same backbone — here is what a reviewer expects to see.
Site Wind Speed
The 3-second-gust V pulled from ASCE 7-22 maps for the exact address — within the 90–105 mph Risk II band, varying by location.
Exposure Justification
B for the urban valley, C for open or lake-side ground — documented per ASCE 7 Section 26.7 surface roughness.
Topographic Kzt
Speed-up analysis for canyon-mouth and bench sites — above 1.0 at the crest, returning to 1.0 away from the feature.
Risk Category
Table 1.5-1 sets which speed map you read — higher category, longer return period, higher V. No fixed multiplier.
MWFRS & C&C
Main system and component-and-cladding pressures for walls, roof panels, windows and doors, all under the same V.
Wind + Snow Combos
Roof design that combines the wind case with the substantial Wasatch-region snow load per ASCE 7-22 load combinations.
Calculations must be sealed by a Professional Engineer licensed in Utah through the Division of Occupational and Professional Licensing. The WindLoadCalc.com calculator assembles every line above into a permit-ready report from a single address.
JURISDICTION DESKS & STATEWIDE GUIDES
Where to Verify Salt Lake City Wind Requirements
Official building desks for the city and county, plus the statewide and standards pages on this site.
SLC Building Services
City permits and inspections desk.
OFFICIALSalt Lake County Inspections
County-wide building inspection authority.
OFFICIALUtah State Construction Code
The adopted IBC/ASCE 7 basis for the state.
CODEUtah DOPL Licensing
PE and architect licensing verification.
LICENSINGUtah Statewide Requirements
How the rest of Utah compares to the valley.
STATEWIDEAll State Requirements
Every state's adopted wind-load basis.
DIRECTORYFROM ADDRESS TO SEALED REPORT
Calculate Wind Loads for Your Wasatch Front Project
Enter a Salt Lake City address and the calculator resolves V, exposure, the canyon topographic factor, risk category and component pressures — then builds a permit-ready package.