Otranto Bridge

Listed on the National Register of Historic Places in 1998.

From the record

One of 12 National Register listings published here for Mitchell County · listed in 1998 · category: Structure.

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

The listing

Listing status. The Park Service records this property as Removed.
What is counted as historic. The nomination lists 1 structure as contributing to the listing.
Address. 480th Ave. over Big Cedar R., St. Ansgar, 50472
When was it listed? May 1998
Category. structure
Also known as. Highway Bridges of Iowa MPS
Township. Otranto township
National Register reference number. 98000495 - 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

3 since 2009

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 3 fires within 5 miles of Otranto Bridge between 2009 and 2011, burning about 3 acres in total. None 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	3

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 June 2009	Missing data/not specified/undetermined	under an acre	Iowa Department of Natural Resources	not named
3 April 2011	Missing data/not specified/undetermined	under an acre	Iowa Department of Natural Resources	4894 485TH, IA
11 April 2009	Missing data/not specified/undetermined	2.0 acres	Iowa Department of Natural Resources	not named

Every fire recorded in Mitchell County

Mines and quarries near this property

6 within 5 miles

Regional context, not property-specific evidence. The federal mineral resources record lists 6 workings within 5 miles of Otranto Bridge: 6 past producers. None of them still produces. What was taken out: Sand and Gravel, Construction, Stone, Crushed/Broken. 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
Falk Quarry	Stone, Crushed/Broken	Past Producer
Pope Quarry	Stone, Crushed/Broken	Past Producer
Unknown	Sand and Gravel, Construction	Past Producer
Unknown	Sand and Gravel, Construction	Past Producer
Unknown	Sand and Gravel, Construction	Past Producer
Unknown	Stone, Crushed/Broken	Past Producer

Every working recorded in Mitchell 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.

Listed places nearby

3 within 8 miles

Other National Register properties close enough to walk or drive between, ordered by distance from this one. Both positions come from the same geocoding pass that matched these properties to their map sheets.

Property	Distance	Listed
Nels Severson Barn	2.9 miles	1977
First Lutheran Church	6.1 miles	1976
Saint Ansgar Public School	6.3 miles	2020

Sources for this property

National Archives record	The nomination case file for reference 98000495 in Record Group 79.
Wikipedia article	Community-written account of this property, licensed CC BY-SA.
Mitchell County	All 12 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.