Little Blackfoot River Bridge

Listed on the National Register of Historic Places in 2010.

From the record

One of 20 National Register listings published here for Powell County · listed in 2010 · category: Structure.

Sources: the case file at the National Archives · the National Register database, National Park Service

The listing

What is counted as historic. The nomination lists 1 structure as contributing to the listing.
Address. Milepost 0 on County Rd. 186 near jct. of US 12, Avon, 59731
When was it listed? January 2010
Category. structure
Also known as. Montana's Historic Steel Truss Bridges
Census division. Avon-Elliston
National Register reference number. 09001185 - the number the National Park Service assigned this property when it was listed, and the key its nomination file is catalogued under at the National Archives.

Fires near this property

25 since 1992

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 25 fires within 5 miles of Little Blackfoot River Bridge between 1992 and 2018, burning about 6 acres in total. 7 started naturally. None was recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

Reported cause	Fires
Missing data/not specified/undetermined	9
Railroad operations and maintenance	7
Natural	7
Equipment and vehicle use	2

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Date	Cause	Size	Reported by	Name on the report
5 September 2013	Natural	under an acre	Southwestern Land Office	GIMLET
17 September 1994	Missing data/not specified/undetermined	under an acre	Southwestern Land Office	STUMP
15 September 1992	Missing data/not specified/undetermined	under an acre	Southwestern Land Office	BRADLEY BEACON
13 September 1996	Natural	under an acre	Southwestern Land Office	BRADLEY BEACON
9 August 1999	Natural	under an acre	Southwestern Land Office	BRADLEY BEACON
6 August 1993	Missing data/not specified/undetermined	under an acre	Southwestern Land Office	BRADLEY BEACON
25 August 2017	Natural	under an acre	Southwestern Land Office	GARRISON TREETOP
18 August 1992	Missing data/not specified/undetermined	under an acre	Southwestern Land Office	AVON EXIT

Every fire recorded in Powell County

Mines and quarries near this property

8 within 5 miles

Regional context, not property-specific evidence. The federal mineral resources record lists 8 workings within 5 miles of Little Blackfoot River Bridge: 4 occurrences, 3 past producers, 1 prospect. None of them still produces. What was taken out: Phosphorus-Phosphates, Uranium, Fluorine-Fluorite, Aluminum, Pumice. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Site	Commodity	Status	Recorded
Granite Gold Mining Co.	Gold	Occurrence
Half-Way Sixmile Creek Bentonite	Bentonite	Occurrence
South End of Garrison Anticline	Phosphorus-Phosphates, REE, Nickel, Vanadium, Chromium, Uranium, Fluorine-Fluorite	Prospect
State Prison Brick Plant	Aluminum	Occurrence
Unnamed Pumice	Pumice	Occurrence
Graveley Mine	Phosphorus-Phosphates, Uranium, Fluorine-Fluorite	Past Producer
Luke Mine	Phosphorus-Phosphates, Uranium, Fluorine-Fluorite	Past Producer	1932, 1936
Luke Mine	Phosphorus-Phosphates	Past Producer	1932

Every working recorded in Powell County

Storms near this property

11 since 1997

Regional context, not property-specific evidence. The National Weather Service names Avon, the town this property stands in, in 11 storm reports between 1997 and 2025: 6 hail, 5 thunderstorm wind. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.

When	Event	Place named	Harm	What the report says
July 2013	Thunderstorm Wind	Avon	$30,000	A very large right-moving supercell tracked east-northeast from Goldcreek to north of Avon bringing with it large hail, severe winds and heavy rain. A rancher 5 miles north of Avon reported a totaled barn, several trees that were either uprooted or broken in half. One of those trees uprooted was a 24 cottonwood.
July 2013	Hail	Avon	$13,000	A very large right-moving supercell unleashed up to ping pong sized hail that decimated a four to five foot tall hay crop. The hail covered the ground to a depth of 2 inches in spots. At least 10 windows were broken. Paint was chipped off from homes. Other damage included a greenhouse roof, vehicle windows and vegetation.
July 2013	Hail	Avon	$3,000	A very large right-moving supercell brought hail and wind damage to ranchers north of Avon. A rancher reported up to half dollar sized hail that brought considerable damage to their hay crop, and windows.
May 2007	Hail	Avon	$2,000	A member of the public reported hail stones that that were between quarter and golfball in size. Damage to a couple of cars was observed.
July 2013	Thunderstorm Wind	Avon	$1,000	A very large supercell brought estimated 60 mph wind gusts that caused several trees to either uproot or break in half. Most of the trees fell in an easterly direction.
July 2016	Hail	Avon	$500	A member of the public reported one inch hail, which caused small damages to vehicles.
September 2025	Thunderstorm Wind	Avon	-	A line of thunderstorms marched northward across west-central Montana with gusty outflow winds. A gust of 59 mph occurred between Avon and Finn along Highway 141. Similar gusts occurred across the Windy Rock Fire southwest of Finn. No damage was noted.
June 2016	Thunderstorm Wind	Avon	-	The Montana DOT weather sensor north of Avon, MT reported a gust of 60 mph between 9:38pm MDT and 9:45pm MDT. Sustained winds at this time were 49 mph.
July 2010	Hail	Avon	-	A fencing company in Avon reported one inch hail.
May 2008	Thunderstorm Wind	Avon	-	Montana Department of Transportation weather station on Highway 141 near Avon recorded peak wind gust of 63 mph.
July 1997	Hail	Avon	-	no account filed

Every storm recorded in Powell County

Map coverage status

No historic map-sheet match is published for this property yet. That does not mean no map exists. This record needs a coordinate-quality review before it can be joined to a sheet boundary. Browse the county's mapped places while that work is pending.

Sources for this property

National Archives record	The nomination case file for reference 09001185 in Record Group 79.
Powell County	All 20 listed properties in this county.

Provenance

Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.
Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.