A weathered wooden covered bridge spans a calm river, supported by stone piers

Siding stopping short of the deck: the ventilation gap that makes the enclosure work. Photo: Terra Stone / Pexels

A Roof Over a Bridge Is a Maintenance Decision

Untreated timber lasts a handful of years wet and many decades dry. The roof and siding exist to keep water off the trusses; everything picturesque about them is a side effect of that arithmetic.

By the Dry Timber deskThe Roof4 min read

Read the argument →

What the roof is for

Timber lasts decades dry and years wet. Every visible decision on a covered bridge follows from that one number.

01Keeps rain out of the truss joints, where rot starts and is hardest to inspect.
02Holds the timber at a stable moisture content, so joints do not work loose through the year.
03Sheds snow off the deck and away from the chord ends at the abutment.
04Braces the top chords laterally: the roof frame is structure, not a hat.

Filed by what the structure is doing

Five sections, twenty-two guides. Every entry names the truss and what that truss solves.

The Roof

Why it is there, and what it is protecting.

Fire and Flood

+ 1 more− fewer

Section 1 →

Trusses

Each type solves a different problem.

+ 3 more− fewer

Section 2 →

Load

Where the force goes, and what fails first.

What Fails First

+ 1 more− fewer

Section 3 →

Building

Raising a span, then and now.

The County That Kept Going

+ 1 more− fewer

Section 4 →

Keeping Them

Repair, replacement and what counts as the same bridge.

What an Inspection Looks For

+ 1 more− fewer

Section 5 →

All 22 guides in one list →

The register

The county’s covered spans by truss type. Lengths are of the covered structure; approximate build years are marked c. An ochre dot marks a span plotted on the map below.

Bridge	Water	Truss	Covered span	Built	Note
Smolen-Gulf	Ashtabula River	Pratt	613 ft	2008	Four spans; the longest covered bridge in the United States
Harpersfield	Grand River	Howe	228 ft	1868	A steel span of c. 140 ft was added after the 1913 flood
State Road	Conneaut Creek	Town lattice	157 ft	1983	First span of the county’s modern building programme
Mechanicsville Road	Grand River	Howe	156 ft	1867	Laminated arch added; oldest span in the county
Benetka Road	Ashtabula River	Town lattice	138 ft	c. 1900	Arch added in a later rebuild
Middle Road	Conneaut Creek	Howe	136 ft	1868
Creek Road	Conneaut Creek	Town lattice	125 ft	c. 1880
Caine Road	Ashtabula River	Pratt	124 ft	1986
Windsor Mills	Phelps Creek	Town lattice	120 ft	1867	Also known as the Wiswell Road bridge
Riverdale Road	Grand River	Town lattice	116 ft	1874
Olin (Dewey Road)	Ashtabula River	Town lattice	115 ft	1873
Netcher Road	Mill Creek	Pratt	110 ft	1998	Neo-Victorian portals
Giddings Road	Mill Creek	Pratt	107 ft	1995
Root Road	Ashtabula River	Town lattice	97 ft	1868
Graham Road	—	Town lattice	97 ft	1913	Rebuilt from flood wreckage; stands beside the road, not over water
Doyle Road	Mill Creek	Town lattice	94 ft	1868
South Denmark Road	Mill Creek	Town lattice	81 ft	1890	Bypassed; carries no traffic
West Liberty Street	Cowles Creek	Kingpost	18 ft	2011	The shortest covered bridge in the United States

The eight longest covered spans in the register, by the length of the covered structure. Smolen-Gulf is nearly three times the next longest.

Town lattice10 of 18Pratt4 of 18Howe3 of 18Kingpost1 of 18

Truss types across the register. The Town lattice dominates because sawn plank and treenails needed no framing shop.

Where the spans are

Four watercourses do most of the work: the Ashtabula River, the Grand River, Conneaut Creek and Mill Creek. The long spans sit where those valleys cut deepest.

Six spans plotted on real coordinates. Hover a name to find it on the map, or a pin to find it here; full dimensions are in the register.

Smolen-GulfPratt613 ft · 2008
Four Pratt spans across the gorge, about ninety feet above the water.
HarpersfieldHowe228 ft · 1868
The covered Howe half meets an open steel span added after the 1913 flood.
Root RoadTown lattice97 ft · 1868
A short lattice span where the river valley narrows.
Netcher RoadPratt110 ft · 1998
Built 1998 on Mill Creek, Pratt in timber with neo-Victorian portals.
Doyle RoadTown lattice94 ft · 1868
Lattice of treenailed plank, still on its original alignment.
Benetka RoadTown lattice138 ft · c. 1900
Lattice with a laminated arch added in a later rebuild.

Covered span in the registerCounty boundary from survey geometry

The cluster follows the creeks rather than the roads: the county line to the east is the Pennsylvania border, the north edge is Lake Erie.

Colophon

Builders, suppliers, and preservation groups whose work keeps covered bridge timber in the air — and whose names we're glad to carry here.

Principal supporters

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