Ada
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
20 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
25 psf
|
|
Frost Depth
|
24"
|
|
Elevation
|
Varies.
|
|
Exposure
|
|
|
|
|
Seismic Design Category
|
Varies.
|
|
Ground Snow Load
|
Varies.
|
|
Wind Load
|
Varies.
|
|
Live Load
|
Varies.
|
|
Frost Depth
|
Varies.
|
|
Elevation
|
Varies.
|
|
Exposure
|
|
Bear Lake
|
| www.bearlakecounty.info |
| Seismic Design Category |
D1 |
| Ground Snow Load |
45 lbs |
| Live Load |
15 lbs |
| Frost Depth |
32 in |
| Elevation |
5964 ft |
| Exposure |
C |
Butte
|
| Seismic Design Category |
D1 |
| Ground Snow Load |
50 lb |
| Live Load |
35 lb |
| Frost Depth |
30" |
| Elevation |
5350 |
Camas
|
|
Seismic Design Category
|
C & Do
|
|
Ground Snow Load
|
90, 100, 125 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
40 psf
|
|
Frost Depth
|
30 in
|
|
Elevation
|
5052
|
|
Exposure
|
Severe
|
Canyon
|
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
25 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
C
|
Clearwater
|
| www.clearwatercounty.org |
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
|
|
Wind Load
|
90 mph
|
|
Live Load
|
Minimums per code
|
|
Frost Depth
|
32"
|
|
Elevation
|
varies from 1000 ft to over 3000 ft; approximate elevations for the city limits of: Orofino 1027; Elk River 2918; Pierce 3087; Weippe 3029
|
|
Exposure
|
|
Elmore
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
120 psf above Tollgate, 30 psi below
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
36” above Featherville, 30” above Tollgate to Featherville, 24" below
|
|
Elevation
|
3000 to 7000
|
|
Exposure
|
B and C
|
Gooding
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
30 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
3500 ft
|
|
Exposure
|
C
|
Fremont
|
|
Seismic Design Category
|
D1
|
|
Ground Snow Load
|
50/90/170 psf
|
|
Wind Load
|
90 mph, 3 sec gusts
|
|
Live Load
|
Snow 35psf/70psf/90psf/128psf over load as per IBC/IRC
|
|
Frost Depth
|
32 in
|
|
Elevation
|
5000-7000 ft
|
|
Exposure
|
|
Jerome
|
| www.jeromecountyid.us |
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
20 psf
|
|
Wind Load
|
115 mph 3 sec gust velocity
|
| Wind Exposure |
C |
| Roof Snow Load |
30 psf |
|
Live Load
|
30 psf
|
| Presumed Soil Bearing Pressure |
1500 psf without soils investigation |
|
Frost Depth
|
24 in
|
|
Elevation
|
4048 ft
|
|
Climate Zone
|
5B
|
Ketchum
|
|
Seismic Design Category
|
D with 35% snow load at time of earthquake. Ss = 73%, S1 = 20.5% or use site specific criteria
|
|
Ground Snow Load
|
120 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
100-psf with 100-plf line load @ eaves and unbalanced loading per ASCE7
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
|
Kootenai
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
Site specific per U of I publication “Ground and Roof Snow for Idaho”
|
|
Wind Load
|
90 mph 3 second gust
|
|
Frost Depth
|
24 in
|
|
Elevation
|
Site specific; 2128+
|
|
Exposure
|
site specific exposure.
|
|
Latah
|
|
Seismic Design Category
|
B
|
|
Roof Snow Load
|
Zones of 30#, 40#, 60#, 80# 100# depending on locations (see County snow load map)
|
|
Wind Load
|
90 mph/3 sec. gusts
|
|
Live Load
|
Soil bearing value 1500 psf
|
|
Frost Depth
|
30 in
|
|
Elevation
|
Range approx.
1400-5000 ft
|
|
Soils
|
U.S. Dept. of Agriculture, Soil Survey of Latah County Area, Idaho, April 1981
|
Lemhi
|
| Seismic Design Category |
|
| Ground Snow Load |
Please contact the local building department for confirmation.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Lincoln
|
| Seismic Design Category |
|
| Ground Snow Load |
30#
|
|
|
|
|
|
30# |
|
|
|
|
|
|
| |
|
Minidoka
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
25 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
|
Nez Perce
|
| www.co.nezperce.id.us |
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
25 - 70 psf
|
|
Wind Load
|
115 mph
|
|
Live Load
|
30 psf
|
|
Weathering
|
Severe |
|
Frost Depth
|
24-48 in
|
|
Termite
|
Slight to Moderate |
|
Decay
|
None to Slight |
|
Winter Design Temp
|
10 degrees F |
|
Flood Hazards
|
FIRM maps as currently adopted |
| Mean annual temp |
51 degrees F
|
| Climate zone |
5 and Marine 4 |
|
Elevation
|
745 - 4800
|
|
Exposure
|
|
Owyhee
|
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
20 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
Roof snow load below 6000 ft. 25 psf. Above 6000 ft. 35 psf
|
|
Weathering
|
Severe
|
|
Frost Depth
|
24 in
|
|
Termite
|
Slight to Moderate
|
|
Decay
|
None to Slight
|
|
Winter Design Temp
|
10 Degree F
|
|
Ice shield
Under- layment
|
Not required
|
|
Flood Hazards
|
FIRM maps as currently adopted
|
|
Air Freezing Index
|
980
|
|
Mean Annual Temp
|
51 Degrees F
|
|
Elevation
|
|
|
Exposure
|
|
Power
|
|
Seismic Design Category
|
Group I, Site Class D, Design Category D
|
|
Ground Snow Load
|
45 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30psf
|
|
Frost Depth
|
30 in
|
|
Elevation
|
4600-5200 ft
|
|
Exposure
|
|
Teton
|
|
Seismic Design Category
|
D1
|
|
Ground Snow Load
|
60 -130 psf
|
|
Live Load
|
85 lbs per square ft
+ dead load + drift
|
|
Wind Load
|
90 mph
|
|
Frost Depth
|
32 in
|
|
Elevation
|
6000 ft
|
|
Exposure
|
|
Twin Falls
|
| www.twinfallscounty.org |
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
30 psf
|
|
Wind Load
|
90 mph with 3 second gust
|
| Soil bearing pressure |
1500# |
| Flood zone |
site specific |
|
Termite
|
Slight
|
|
Frost Depth
|
24 in min
|
|
Elevation
|
2900-4900 ft
|
|
Weathering
|
Severe
|
|
Unless determined differently based on the site evaluation by a qualified design professional. (Ord. 217, 12-16-2010)
|
Whitman
|
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
30 psf
|
|
Wind Load
|
85 mph
|
|
Live Load
|
IBC IRC
|
|
Frost Depth
|
32 in. Ice shield under-layment required. Mean annual temp 42 degrees.
|
|
Elevation
|
|
|
Exposure
|
|
|
|
|
Acequia
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
25 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
|
Ammon
|
|
Seismic Design Category
|
D1
|
|
Ground Snow Load
|
50 psf
|
|
Wind Load
|
90 mph, 3 sec gust
|
|
Live Load
|
Per building code
|
|
Frost Depth
|
30 in
|
|
Elevation
|
|
|
Exposure
|
|
Blackfoot
|
|
Seismic Design Category
|
Category C; Site Class
|
|
Ground Snow Load
|
30 psf
|
|
Wind Load
|
Exposure C 90mph/105, 3 sec gust
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
30 in
|
|
Elevation
|
4488 ft
|
|
Exposure
|
|
Boise
|
|
Seismic Design Category
|
2003 IRC is Design Category C. 2003 IBC is based on Section 1614
|
|
Ground Snow Load
|
Per local ordinance it is 20 psf with further statement that snow loads shall be determined per Section 7 of ASCE 7, but the design roof load shall not be less than a uniform snow load of 25 psf
|
|
Wind Load
|
90 mph for both 2003 IRC and 2003 IBC
|
|
Live Load
|
per 2003 IRC and 2003 IBC
|
|
Frost Depth
|
24 in
|
|
Elevation
|
2842 ft
|
|
Exposure
|
|
Caldwell
|
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
20 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
25 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
|
Chubbuck
|
|
Seismic Design Category
|
D1
|
|
Ground Snow Load
|
45 psf
|
|
Wind Load
|
70 mph and 90 mph, 3 sec gust
|
|
Live Load
|
36 psf
|
|
Frost Depth
|
36 in
|
|
Elevation
|
4470 ft
|
|
Exposure
|
|
Coeur d'Alene
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
60 psf
|
|
Wind Load
|
90 mph, 3 sec gusts
|
|
Live Load
|
40 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
2128-2860 ft
|
|
Exposure
|
|
Fruitland
|
| Seismic Design Category |
C |
| Ground Snow Load |
25 |
| Live Load |
20 |
| Frost Depth |
24 in |
| Exposure |
C |
Gooding
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
30 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
3500 ft
|
|
Exposure
|
C
|
Hailey
|
|
Seismic Design Category
|
D1
|
|
Ground Snow Load
|
143 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
100 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
Approx. 5600 ft
|
|
Exposure
|
|
Hayden
|
| www.cityofhaydenid.us |
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
60 psf
|
|
Wind Load
|
90 mph, 3 second gusts
|
|
Live Load
|
40 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
2287 ft
|
|
Exposure
|
Site specific exposure
|
Heyburn
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
25 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
|
Idaho Falls
|
|
Seismic Design Category
|
D
|
|
Ground Snow Load
|
47 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
|
|
Frost Depth
|
30 in
|
|
Elevation
|
4710 ft
|
|
Exposure
|
C
|
Lewiston
|
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
30 psf
|
|
Wind Load
|
90 mph, 3 sec gust
|
|
Frost Depth
|
24 in
|
|
Elevation
|
Lowest 739 ft, Highest 1550 ft
|
McCall
|
|
Seismic Design Category
|
D
|
|
Ground Snow Load
|
150 psf, but the engineered design roof load shall not be less than a uniform snow load of 120 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
Varies
|
|
Frost Depth
|
24 in
|
|
Elevation
|
5200 to 5300 ft
|
|
Exposure
|
Varies
|
Moscow
|
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
64 psf
|
|
Wind Load
|
90 mph, 3 sec gust
|
|
Live Load
|
Snow 40 psf, minimums per code
|
|
Frost Depth
|
30 in
|
|
Elevation
|
2500 to 2800 ft
|
|
Exposure
|
C
|
Nampa
|
|
Seismic Design Category
|
2009 IRC
2009 IBC
|
|
Ground Snow Load
|
25 psf, collateral load of 5 psf
|
|
Roof Snow Load
|
20 psf, collateral load of 5 psf |
|
Wind Load
|
90 mph for both 2003 IRC and 2003 IBC
|
|
Live Load
|
per 2003 IRC and 2003 IBC
|
|
Frost Depth
|
24 inches
|
|
Elevation
|
2600 ft.
|
|
Exposure
|
B or C
|
Orofino
|
|
Seismic Design Category
|
B
|
|
Ground Snow Load
|
30 psf
|
|
Wind Load
|
90 mph with 3 sec gust
|
|
Live Load
|
25 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
1000 ft
|
|
Exposure
|
|
Paul
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
25 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
|
Pocatello
|
| www.pocatello.us |
|
Seismic Design Category
|
C or D depending on the building classification and engineers calculation Default “D”
|
|
Ground Snow Load
|
45 psf
|
|
Wind Load
|
Per IBC maps 90 mph 3 second gust
|
|
Live Load
|
31.5 lbs with calculations or default 35 lbs
|
|
Frost Depth
|
36 in
|
|
Elevation
|
4250 ft
|
|
Exposure
|
Default C
|
Prist River
|
| www.priestriver-id.gov |
| Seismic Design Category |
C |
| Ground Snow Load |
73 |
| Live Load |
50 Residential 60 Commecial |
| Frost Depth |
24" |
| Elevation |
2100 |
| Weathering |
Severe |
| Termite |
None to slight |
| Decay |
None |
| Winter Design Temp |
10 Degrees |
Rathdrum
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
56 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
40 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
|
Rexburg
|
|
Seismic Design Category
|
Depends upon rock profile. Usually D but can be C
|
|
Ground Snow Load
|
50 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
Same as IBC – IRC
|
|
Frost Depth
|
36 in
|
|
Elevation
|
4865-5080 ft
|
|
Exposure
|
|
Rupert
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
25 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
30 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
|
|
Exposure
|
|
Sandpoint
|
| www.cityofsandpoint.com |
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
104 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
55 psf
|
|
Frost Depth
|
24 in
|
|
Elevation
|
2075 ft
|
|
Exposure
|
B or C
|
Soda Springs
|
|
Seismic Design Category
|
D
|
|
Ground Snow Load
|
60 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
|
|
Frost Depth
|
36 in
|
|
Elevation
|
5800-6000 ft
|
|
Exposure
|
|
Spirit Lake
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
56 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
40 psf
|
|
Frost Depth
|
24in
|
|
Elevation
|
|
|
Exposure
|
|
Sun Valley
|
|
Seismic Design Category
|
D1or per IBC Chapter 16
|
|
Ground Snow Load
|
120 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
|
|
Frost Depth
|
24 in
|
|
Elevation
|
5920 +/-
|
|
Exposure
|
B
|
Twin Falls
|
| www.tfid.org |
|
Seismic Design Category
|
Site class C
|
|
Roof Snow Load
|
25 psf
|
| Ground Snow Load |
15 psf. |
|
Wind Load
|
90 mph, 3 sec gust velocity
|
| Wind exposure |
B (C in some areas) |
|
Live Load
|
Per IBC, but Section 1608 is amended to include that the minimum uniformly distributed design load shall be 25 psf
|
| Presumed soil bearing pressure |
1500psf without soils investigation |
|
Frost Depth
|
24 in
|
| Climate Zone |
5B |
| Water heating design temp |
2 degrees (99% dry bulb) |
| Elevation |
3700 |
| Exposure |
Fastest mile/3 second gust 75mph/90mph exposure C. |
|
Table R301.5 is amended to require a minimum uniform live load of 40 psf in habitable attics and sleeping rooms.
Foundations with stem walls shall be provided with a minimum of one # 4 bar at the top of the wall and one #4 bar at the bottom of the footing. #4 vertical bars are required at 6 feet on center.
Basement walls to have one #4 horizontal bar at 4 feet on center. One #4 bar is also required horizontally and vertically around openings, extending 2 feet beyond the opening. One #4 bar to be placed diagonally at corners of openings subject to cracking. Vertical bars installed per IRC.
Unvented fuel-burning appliances are not allowed.
30” minimum crawl space depth measured from bottom of floor joist (per local resolution)
|
Weiser
|
|
Seismic Design Category
|
C
|
|
Ground Snow Load
|
30 psf
|
|
Wind Load
|
90 mph
|
|
Live Load
|
Per 2009 IRC and 2009 IBC
|
|
Weathering
|
Severe
|
|
Frost Depth
|
24 in
|
|
Termite
|
|
|
Decay
|
|
|
Winter Design Temp
|
|
|
Ice shield
Under- layment
|
|
|
Flood Hazards
|
FIRM Maps Effective date June 16, 2009
|
|
Air Freezing Index
|
980
|
|
Mean Annual Temp
|
50 Degrees F
|
|
Elevation
|
2129
|
|
Exposure
|
|
|
|
|
|
PO Box 8224, Boise, ID 83707